diff --git a/language/common_res.h b/language/common_res.h
index 255387e2f..545438957 100644
--- a/language/common_res.h
+++ b/language/common_res.h
@@ -1281,6 +1281,7 @@
 #define IDS_LEX_2ND_CH_MODIFIED         63394
 #define IDS_LEX_2ND_CH_REV_TO_ORG       63395
 #define IDS_LEX_2ND_CH_REV_TO_MOD       63396
+#define IDS_LEX_STR_63397               63397
 
 
 #define IDS_LEX_CSV_COL_0               63490
diff --git a/language/np3_de_de/lexer_de_de.rc b/language/np3_de_de/lexer_de_de.rc
index e8931845f..b7cd092b8 100644
--- a/language/np3_de_de/lexer_de_de.rc
+++ b/language/np3_de_de/lexer_de_de.rc
@@ -495,6 +495,7 @@ BEGIN
     IDS_LEX_STR_63386       "Symbol Identifier"
     IDS_LEX_STR_63387       "Symbol Operator"
     IDS_LEX_STR_63388       "String EOL"
+    IDS_LEX_STR_63397       "Backticks"
 END
 
 STRINGTABLE
diff --git a/language/np3_en_us/lexer_en_us.rc b/language/np3_en_us/lexer_en_us.rc
index f92b0a42a..e220b3016 100644
--- a/language/np3_en_us/lexer_en_us.rc
+++ b/language/np3_en_us/lexer_en_us.rc
@@ -495,6 +495,7 @@ BEGIN
     IDS_LEX_STR_63386       "Symbol Identifier"
     IDS_LEX_STR_63387       "Symbol Operator"
     IDS_LEX_STR_63388       "String EOL"
+    IDS_LEX_STR_63397       "Backticks"
 END
 
 STRINGTABLE
diff --git a/lexilla/cppcheck.suppress b/lexilla/cppcheck.suppress
index a161ff132..76777ea90 100644
--- a/lexilla/cppcheck.suppress
+++ b/lexilla/cppcheck.suppress
@@ -17,10 +17,12 @@ noExplicitConstructor
 // code legibility.
 passedByValue
 
+// This could be fixed but it should be rewritten to use string_view which doesn't have resize
+uselessCallsSubstr:lexilla/lexers/LexCPP.cxx
+
 // Suppress most lexer warnings since the lexers are maintained by others
 redundantCondition:lexilla/lexers/LexA68k.cxx
 constParameter:lexilla/lexers/LexAbaqus.cxx
-unusedStructMember:lexilla/lexers/LexAsciidoc.cxx
 constParameterCallback:lexilla/lexers/LexAsn1.cxx
 knownConditionTrueFalse:lexilla/lexers/LexAU3.cxx
 shadowVariable:lexilla/lexers/LexAU3.cxx
@@ -43,6 +45,7 @@ knownConditionTrueFalse:lexilla/lexers/LexEiffel.cxx
 variableScope:lexilla/lexers/LexErlang.cxx
 knownConditionTrueFalse:lexilla/lexers/LexEScript.cxx
 constParameter:lexilla/lexers/LexFortran.cxx
+redundantContinue:lexilla/lexers/LexFortran.cxx
 redundantCondition:lexilla/lexers/LexFSharp.cxx
 knownConditionTrueFalse:lexilla/lexers/LexFSharp.cxx
 constParameter:lexilla/lexers/LexGDScript.cxx
@@ -102,12 +105,16 @@ knownConditionTrueFalse:lexilla/lexers/LexTxt2tags.cxx
 knownConditionTrueFalse:lexilla/lexers/LexVB.cxx
 constParameter:lexilla/lexers/LexVerilog.cxx
 variableScope:lexilla/lexers/LexVerilog.cxx
+badBitmaskCheck:lexilla/lexers/LexVerilog.cxx
+uselessCallsSubstr:lexilla/lexers/LexVerilog.cxx
 constParameter:lexilla/lexers/LexVHDL.cxx
 shadowVariable:lexilla/lexers/LexVHDL.cxx
 unreadVariable:lexilla/lexers/LexVHDL.cxx
 variableScope:lexilla/lexers/LexVHDL.cxx
 unreadVariable:lexilla/lexers/LexVisualProlog.cxx
 unreadVariable:lexilla/lexers/LexX12.cxx
+constVariable:lexilla/lexers/LexX12.cxx
+uselessCallsSubstr:lexilla/lexers/LexX12.cxx
 constParameter:lexilla/lexers/LexYAML.cxx
 knownConditionTrueFalse:lexilla/lexers/LexYAML.cxx
 
@@ -136,7 +143,6 @@ constVariable:lexilla/lexers/LexModula.cxx
 constVariable:lexilla/lexers/LexOpal.cxx
 constVariable:lexilla/lexers/LexPS.cxx
 constVariable:lexilla/lexers/LexPascal.cxx
-constVariable:lexilla/lexers/LexR.cxx
 constVariable:lexilla/lexers/LexRebol.cxx
 constVariable:lexilla/lexers/LexRuby.cxx
 constVariable:lexilla/lexers/LexSorcus.cxx
diff --git a/lexilla/doc/Lexilla.html b/lexilla/doc/Lexilla.html
index bc42fc49c..13f780317 100644
--- a/lexilla/doc/Lexilla.html
+++ b/lexilla/doc/Lexilla.html
@@ -9,7 +9,7 @@
     <meta name="keywords" content="Scintilla, SciTE, Editing Component, Text Editor" />
     <meta name="Description"
     content="www.scintilla.org is the home of the Scintilla editing component and SciTE text editor application." />
-    <meta name="Date.Modified" content="20220827" />
+    <meta name="Date.Modified" content="20221012" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <style type="text/css">
         .logo {
@@ -61,8 +61,8 @@
           <font color="#FFCC99" size="4"> A library of language lexers for use with Scintilla</font>
         </td>
         <td width="40%" align="right">
-          <font color="#FFCC99" size="3">Release version 5.1.9<br />
-           Site last modified August 27 2022</font>
+          <font color="#FFCC99" size="3">Release version 5.2.0<br />
+           Site last modified October 12 2022</font>
         </td>
         <td width="20%">
           &nbsp;
@@ -77,12 +77,12 @@
       </tr>
     </table>
     <ul id="versionlist">
+      <li>Version 5.2.0 improves PowerShell and R.</li>
       <li>Version 5.1.9 improves Julia and Properties.</li>
       <li>Version 5.1.8 improves F#, MS SQL, PowerShell, and Visual Prolog.</li>
       <li>Version 5.1.7 improves CMake, HTML, Matlab, Raku, Ruby, and VHDL.</li>
       <li>Version 5.1.6 improves Markdown and Ruby.</li>
       <li>Version 5.1.5 improves Bash, Batch, F#, HTML, Inno Setup, and Python.</li>
-      <li>Version 5.1.4 adds lexers for AsciiDoc and GDScript.</li>
     </ul>
     <ul id="menu">
       <li id="remote1"><a href="https://www.scintilla.org/SciTEImage.html">Screenshot</a></li>
diff --git a/lexilla/doc/LexillaDownload.html b/lexilla/doc/LexillaDownload.html
index a0be3f242..64636e19a 100644
--- a/lexilla/doc/LexillaDownload.html
+++ b/lexilla/doc/LexillaDownload.html
@@ -26,9 +26,9 @@
     <table bgcolor="#CCCCCC" width="100%" cellspacing="0" cellpadding="8" border="0">
       <tr>
         <td>
-          <font size="4"> <a href="https://www.scintilla.org/lexilla519.zip">
+          <font size="4"> <a href="https://www.scintilla.org/lexilla520.zip">
 	Windows</a>&nbsp;&nbsp;
-	<a href="https://www.scintilla.org/lexilla519.tgz">
+	<a href="https://www.scintilla.org/lexilla520.tgz">
           GTK/Linux</a>&nbsp;&nbsp;
 	</font>
         </td>
@@ -42,7 +42,7 @@
       containing very few restrictions.
     </p>
     <h3>
-       Release 5.1.9
+       Release 5.2.0
     </h3>
     <h4>
        Source Code
@@ -50,8 +50,8 @@
        The source code package contains all of the source code for Lexilla but no binary
 	executable code and is available in
        <ul>
-       <li><a href="https://www.scintilla.org/lexilla519.zip">zip format</a> (1.2M) commonly used on Windows</li>
-       <li><a href="https://www.scintilla.org/lexilla519.tgz">tgz format</a> (0.9M) commonly used on Linux and compatible operating systems</li>
+       <li><a href="https://www.scintilla.org/lexilla520.zip">zip format</a> (1.2M) commonly used on Windows</li>
+       <li><a href="https://www.scintilla.org/lexilla520.tgz">tgz format</a> (0.9M) commonly used on Linux and compatible operating systems</li>
        </ul>
        Instructions for building on both Windows and Linux are included in the readme file.
     <h4>
diff --git a/lexilla/doc/LexillaHistory.html b/lexilla/doc/LexillaHistory.html
index 010593884..6d4727fa3 100644
--- a/lexilla/doc/LexillaHistory.html
+++ b/lexilla/doc/LexillaHistory.html
@@ -585,6 +585,43 @@
     </tr>
     </table>
     <h2>Releases</h2>
+    <h3>
+       <a href="https://www.scintilla.org/lexilla520.zip">Release 5.2.0</a>
+    </h3>
+    <ul>
+	<li>
+	Released 12 October 2022.
+	</li>
+	<li>
+	PowerShell: End comment before \r carriage return so \r and \n in same
+	SCE_POWERSHELL_DEFAULT style.
+	<a href="https://github.com/ScintillaOrg/lexilla/pull/99">Pull request #99</a>.
+	</li>
+	<li>
+	PowerShell: Fix character truncation bug that lead to 'ġ' styled as an operator since its low 8 bits
+	are equal to '!'.
+	</li>
+	<li>
+	R: Support hexadecimal, float exponent and number suffix.
+	<a href="https://github.com/ScintillaOrg/lexilla/issues/101">Issue #101</a>.
+	</li>
+	<li>
+	R: Highlight backticks.
+	<a href="https://github.com/ScintillaOrg/lexilla/pull/102">Pull request #102</a>.
+	</li>
+	<li>
+	R: Highlight raw strings.
+	<a href="https://github.com/ScintillaOrg/lexilla/issues/100">Issue #100</a>.
+	</li>
+	<li>
+	R: Optionally highlight escape sequences in strings.
+	<a href="https://github.com/ScintillaOrg/lexilla/issues/100">Issue #100</a>.
+	</li>
+	<li>
+	Fix early truncation from LexAccessor::GetRange and LexAccessor::GetRangeLowered.
+	<a href="https://github.com/ScintillaOrg/lexilla/issues/17">Issue #17</a>.
+	</li>
+    </ul>
     <h3>
        <a href="https://www.scintilla.org/lexilla519.zip">Release 5.1.9</a>
     </h3>
diff --git a/lexilla/include/LexicalStyles.iface b/lexilla/include/LexicalStyles.iface
index 845968e5a..17bc71367 100644
--- a/lexilla/include/LexicalStyles.iface
+++ b/lexilla/include/LexicalStyles.iface
@@ -1569,6 +1569,10 @@ val SCE_R_OPERATOR=8
 val SCE_R_IDENTIFIER=9
 val SCE_R_INFIX=10
 val SCE_R_INFIXEOL=11
+val SCE_R_BACKTICKS=12
+val SCE_R_RAWSTRING=13
+val SCE_R_RAWSTRING2=14
+val SCE_R_ESCAPESEQUENCE=15
 # Lexical state for SCLEX_MAGIK
 lex MagikSF=SCLEX_MAGIK SCE_MAGIK_
 val SCE_MAGIK_DEFAULT=0
diff --git a/lexilla/include/SciLexer.h b/lexilla/include/SciLexer.h
index e0ae274b5..8a0a5cfa2 100644
--- a/lexilla/include/SciLexer.h
+++ b/lexilla/include/SciLexer.h
@@ -1396,6 +1396,10 @@
 #define SCE_R_IDENTIFIER 9
 #define SCE_R_INFIX 10
 #define SCE_R_INFIXEOL 11
+#define SCE_R_BACKTICKS 12
+#define SCE_R_RAWSTRING 13
+#define SCE_R_RAWSTRING2 14
+#define SCE_R_ESCAPESEQUENCE 15
 #define SCE_MAGIK_DEFAULT 0
 #define SCE_MAGIK_COMMENT 1
 #define SCE_MAGIK_HYPER_COMMENT 16
diff --git a/lexilla/lexers/LexCPP.cxx b/lexilla/lexers/LexCPP.cxx
index 311eb3859..56bb18def 100644
--- a/lexilla/lexers/LexCPP.cxx
+++ b/lexilla/lexers/LexCPP.cxx
@@ -169,7 +169,7 @@ class EscapeSequence {
 	int digitsLeft = 0;
 public:
 	EscapeSequence() = default;
-	void resetEscapeState(int nextChar) {
+	void resetEscapeState(int nextChar) noexcept {
 		digitsLeft = 0;
 		escapeSetValid = &setNoneNumeric;
 		if (nextChar == 'U') {
@@ -186,7 +186,7 @@ public:
 			escapeSetValid = &setOctDigits;
 		}
 	}
-	bool atEscapeEnd(int currChar) const {
+	bool atEscapeEnd(int currChar) const noexcept {
 		return (digitsLeft <= 0) || !escapeSetValid->Contains(currChar);
 	}
 	void consumeDigit() noexcept {
@@ -314,9 +314,8 @@ public:
 	LinePPState ForLine(Sci_Position line) const noexcept {
 		if ((line > 0) && (vlls.size() > static_cast<size_t>(line))) {
 			return vlls[line];
-		} else {
-			return LinePPState();
 		}
+		return {};
 	}
 	void Add(Sci_Position line, LinePPState lls) {
 		vlls.resize(line+1);
@@ -727,6 +726,8 @@ Sci_Position SCI_METHOD LexerCPP::WordListSet(int n, const char *wl) {
 	case 5:
 		wordListN = &markerList;
 		break;
+	default:
+		break;
 	}
 	Sci_Position firstModification = -1;
 	if (wordListN) {
@@ -1426,7 +1427,7 @@ void SCI_METHOD LexerCPP::Lex(Sci_PositionU startPos, Sci_Position length, int i
 							if (options.updatePreprocessor && preproc.IsActive()) {
 								const std::string restOfLine = GetRestOfLine(styler, sc.currentPos + 5, false);
 								Tokens tokens = Tokenize(restOfLine);
-								if (tokens.size() >= 1) {
+								if (!tokens.empty()) {
 									const std::string key = tokens[0];
 									preprocessorDefinitions.erase(key);
 									ppDefineHistory.emplace_back(lineCurrent, key, "", true);
@@ -1812,7 +1813,7 @@ bool LexerCPP::EvaluateExpression(const std::string &expr, const SymbolTable &pr
 
 	// "0" or "" -> false else true
 	const bool isFalse = tokens.empty() ||
-		((tokens.size() == 1) && (((tokens[0]).empty()) || tokens[0] == "0"));
+		((tokens.size() == 1) && (tokens[0].empty() || tokens[0] == "0"));
 	return !isFalse;
 }
 
diff --git a/lexilla/lexers/LexPowerShell.cxx b/lexilla/lexers/LexPowerShell.cxx
index 90be116c1..6c9e11ad8 100644
--- a/lexilla/lexers/LexPowerShell.cxx
+++ b/lexilla/lexers/LexPowerShell.cxx
@@ -29,19 +29,19 @@
 using namespace Lexilla;
 
 // Extended to accept accented characters
-static inline bool IsAWordChar(int ch) {
-	return ch >= 0x80 || isalnum(ch & 0xFF) || ch == '-' || ch == '_';
+static inline bool IsAWordChar(int ch) noexcept {
+	return ch >= 0x80 || isalnum(ch) || ch == '-' || ch == '_';
 }
 
 static void ColourisePowerShellDoc(Sci_PositionU startPos, Sci_Position length, int initStyle,
 				   WordList *keywordlists[], Accessor &styler) {
 
-	WordList &keywords = *keywordlists[0];
-	WordList &keywords2 = *keywordlists[1];
-	WordList &keywords3 = *keywordlists[2];
-	WordList &keywords4 = *keywordlists[3];
-	WordList &keywords5 = *keywordlists[4];
-	WordList &keywords6 = *keywordlists[5];
+	const WordList &keywords = *keywordlists[0];
+	const WordList &keywords2 = *keywordlists[1];
+	const WordList &keywords3 = *keywordlists[2];
+	const WordList &keywords4 = *keywordlists[3];
+	const WordList &keywords5 = *keywordlists[4];
+	const WordList &keywords6 = *keywordlists[5];
 
 	styler.StartAt(startPos);
 
@@ -50,7 +50,7 @@ static void ColourisePowerShellDoc(Sci_PositionU startPos, Sci_Position length,
 	for (; sc.More(); sc.Forward()) {
 
 		if (sc.state == SCE_POWERSHELL_COMMENT) {
-			if (sc.atLineEnd) {
+			if (sc.MatchLineEnd()) {
 				sc.SetState(SCE_POWERSHELL_DEFAULT);
 			}
 		} else if (sc.state == SCE_POWERSHELL_COMMENTSTREAM) {
@@ -107,7 +107,7 @@ static void ColourisePowerShellDoc(Sci_PositionU startPos, Sci_Position length,
 				sc.SetState(SCE_POWERSHELL_DEFAULT);
 			}
 		} else if (sc.state == SCE_POWERSHELL_OPERATOR) {
-			if (!isoperator(static_cast<char>(sc.ch))) {
+			if (!isoperator(sc.ch)) {
 				sc.SetState(SCE_POWERSHELL_DEFAULT);
 			}
 		} else if (sc.state == SCE_POWERSHELL_IDENTIFIER) {
@@ -148,7 +148,7 @@ static void ColourisePowerShellDoc(Sci_PositionU startPos, Sci_Position length,
 				sc.SetState(SCE_POWERSHELL_VARIABLE);
 			} else if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
 				sc.SetState(SCE_POWERSHELL_NUMBER);
-			} else if (isoperator(static_cast<char>(sc.ch))) {
+			} else if (isoperator(sc.ch)) {
 				sc.SetState(SCE_POWERSHELL_OPERATOR);
 			} else if (IsAWordChar(sc.ch)) {
 				sc.SetState(SCE_POWERSHELL_IDENTIFIER);
@@ -165,10 +165,10 @@ static void ColourisePowerShellDoc(Sci_PositionU startPos, Sci_Position length,
 // and to make it possible to fiddle the current level for "} else {".
 static void FoldPowerShellDoc(Sci_PositionU startPos, Sci_Position length, int initStyle,
 			      WordList *[], Accessor &styler) {
-	bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
-	bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
-	bool foldAtElse = styler.GetPropertyInt("fold.at.else", 0) != 0;
-	Sci_PositionU endPos = startPos + length;
+	const bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
+	const bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
+	const bool foldAtElse = styler.GetPropertyInt("fold.at.else", 0) != 0;
+	const Sci_PositionU endPos = startPos + length;
 	int visibleChars = 0;
 	Sci_Position lineCurrent = styler.GetLine(startPos);
 	int levelCurrent = SC_FOLDLEVELBASE;
@@ -180,12 +180,12 @@ static void FoldPowerShellDoc(Sci_PositionU startPos, Sci_Position length, int i
 	int styleNext = styler.StyleAt(startPos);
 	int style = initStyle;
 	for (Sci_PositionU i = startPos; i < endPos; i++) {
-		char ch = chNext;
+		const char ch = chNext;
 		chNext = styler.SafeGetCharAt(i + 1);
-		int stylePrev = style;
+		const int stylePrev = style;
 		style = styleNext;
 		styleNext = styler.StyleAt(i + 1);
-		bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
+		const bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
 		if (style == SCE_POWERSHELL_OPERATOR) {
 			if (ch == '{') {
 				// Measure the minimum before a '{' to allow
diff --git a/lexilla/lexers/LexR.cxx b/lexilla/lexers/LexR.cxx
index 676b6b643..27db9fc93 100644
--- a/lexilla/lexers/LexR.cxx
+++ b/lexilla/lexers/LexR.cxx
@@ -6,12 +6,8 @@
 // Copyright 1998-2002 by Neil Hodgson <neilh@scintilla.org>
 // The License.txt file describes the conditions under which this software may be distributed.
 
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <assert.h>
-#include <ctype.h>
+#include <cassert>
+#include <cctype>
 
 #include <string>
 #include <string_view>
@@ -29,17 +25,17 @@
 
 using namespace Lexilla;
 
-static inline bool IsAWordChar(const int ch) {
-	return IsASCII(ch) && (isalnum(ch) || ch == '.' || ch == '_');
+namespace {
+
+inline bool IsAWordChar(int ch) noexcept {
+	return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_');
 }
 
-static inline bool IsAWordStart(const int ch) {
-	return IsASCII(ch) && (isalnum(ch) || ch == '_');
+inline bool IsAWordStart(int ch) noexcept {
+	return (ch < 0x80) && (isalnum(ch) || ch == '_');
 }
 
-static inline bool IsAnOperator(const int ch) {
-	if (IsASCII(ch) && isalnum(ch))
-		return false;
+constexpr bool IsAnOperator(int ch) noexcept {
 	// '.' left out as it is used to make up numbers
 	if (ch == '-' || ch == '+' || ch == '!' || ch == '~' ||
 	        ch == '?' || ch == ':' || ch == '*' || ch == '/' ||
@@ -51,36 +47,103 @@ static inline bool IsAnOperator(const int ch) {
 	return false;
 }
 
-static void ColouriseRDoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *keywordlists[],
+constexpr bool IsOctalOrHex(int ch, bool hex) noexcept {
+	return IsAnOctalDigit(ch) || (hex && IsAHeXDigit(ch));
+}
+
+// https://search.r-project.org/R/refmans/base/html/Quotes.html
+struct EscapeSequence {
+	int outerState = SCE_R_DEFAULT;
+	int digitsLeft = 0;
+	bool hex = false;
+	bool brace = false;
+
+	// highlight any character as escape sequence, unrecognized escape sequence is syntax error.
+	void resetEscapeState(int state, int chNext) noexcept {
+		outerState = state;
+		digitsLeft = 1;
+		hex = true;
+		brace = false;
+		if (chNext == 'x') {
+			digitsLeft = 3;
+		} else if (chNext == 'u') {
+			digitsLeft = 5;
+		} else if (chNext == 'U') {
+			digitsLeft = 9;
+		} else if (IsAnOctalDigit(chNext)) {
+			digitsLeft = 3;
+			hex = false;
+		}
+	}
+	bool atEscapeEnd(int ch) noexcept {
+		--digitsLeft;
+		return digitsLeft <= 0 || !IsOctalOrHex(ch, hex);
+	}
+};
+
+int CheckRawString(LexAccessor &styler, Sci_Position pos, int &dashCount) {
+	dashCount = 0;
+	while (true) {
+		const char ch = styler.SafeGetCharAt(pos++);
+		switch (ch) {
+		case '-':
+			++dashCount;
+			break;
+		case '(':
+			return ')';
+		case '[':
+			return ']';
+		case '{':
+			return '}';
+		default:
+			dashCount = 0;
+			return 0;
+		}
+	}
+}
+
+void ColouriseRDoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *keywordlists[],
                             Accessor &styler) {
 
-	WordList &keywords   = *keywordlists[0];
-	WordList &keywords2 = *keywordlists[1];
-	WordList &keywords3 = *keywordlists[2];
-
-
-	// Do not leak onto next line
-	if (initStyle == SCE_R_INFIXEOL)
-		initStyle = SCE_R_DEFAULT;
+	const WordList &keywords   = *keywordlists[0];
+	const WordList &keywords2 = *keywordlists[1];
+	const WordList &keywords3 = *keywordlists[2];
+	// state for raw string
+	int matchingDelimiter = 0;
+	int dashCount = 0;
 
+	// property lexer.r.escape.sequence
+	//	Set to 1 to enable highlighting of escape sequences in strings.
+	const bool escapeSequence = styler.GetPropertyInt("lexer.r.escape.sequence", 0) != 0;
+	EscapeSequence escapeSeq;
 
 	StyleContext sc(startPos, length, initStyle, styler);
-
-	for (; sc.More(); sc.Forward()) {
-
-		if (sc.atLineStart && (sc.state == SCE_R_STRING)) {
-			// Prevent SCE_R_STRINGEOL from leaking back to previous line
-			sc.SetState(SCE_R_STRING);
+	if (sc.currentLine > 0) {
+		const int lineState = styler.GetLineState(sc.currentLine - 1);
+		matchingDelimiter = lineState & 0xff;
+		dashCount = lineState >> 8;
 		}
 
+	for (; sc.More(); sc.Forward()) {
 		// Determine if the current state should terminate.
-		if (sc.state == SCE_R_OPERATOR) {
+		switch (sc.state) {
+		case SCE_R_OPERATOR:
 			sc.SetState(SCE_R_DEFAULT);
-		} else if (sc.state == SCE_R_NUMBER) {
-			if (!IsADigit(sc.ch) && !(sc.ch == '.' && IsADigit(sc.chNext))) {
+			break;
+
+		case SCE_R_NUMBER:
+			// https://cran.r-project.org/doc/manuals/r-release/R-lang.html#Literal-constants
+			if (AnyOf(sc.ch, 'e', 'E', 'p', 'P') && (IsADigit(sc.chNext) || sc.chNext == '+' || sc.chNext == '-')) {
+				sc.Forward(); // exponent part
+			} else if (!(IsAHeXDigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext)))) {
+				if (AnyOf(sc.ch, 'L', 'i')) {
+					sc.Forward(); // integer and complex qualifier
+				}
 				sc.SetState(SCE_R_DEFAULT);
 			}
-		} else if (sc.state == SCE_R_IDENTIFIER) {
+			break;
+
+		case SCE_R_IDENTIFIER:
 			if (!IsAWordChar(sc.ch)) {
 				char s[100];
 				sc.GetCurrent(s, sizeof(s));
@@ -93,39 +156,101 @@ static void ColouriseRDoc(Sci_PositionU startPos, Sci_Position length, int initS
 				}
 				sc.SetState(SCE_R_DEFAULT);
 			}
-		} else if (sc.state == SCE_R_COMMENT) {
-			if (sc.ch == '\r' || sc.ch == '\n') {
+			break;
+
+		case SCE_R_COMMENT:
+			if (sc.MatchLineEnd()) {
 				sc.SetState(SCE_R_DEFAULT);
 			}
-		} else if (sc.state == SCE_R_STRING) {
+			break;
+
+		case SCE_R_STRING:
+		case SCE_R_STRING2:
+		case SCE_R_BACKTICKS:
 			if (sc.ch == '\\') {
-				if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
+				if (escapeSequence) {
+					escapeSeq.resetEscapeState(sc.state, sc.chNext);
+					sc.SetState(SCE_R_ESCAPESEQUENCE);
+					sc.Forward();
+					if (sc.chNext == '{' && AnyOf(sc.ch, 'u', 'U')) {
+						escapeSeq.brace = true;
+					sc.Forward();
+					} else if (sc.MatchLineEnd()) {
+						// don't highlight line ending as escape sequence:
+						// escapeSeq.outerState is lost when editing on next line.
+						sc.SetState(escapeSeq.outerState);
+					}
+				} else {
+					sc.Forward(); // Skip all characters after the backslash
+				}
+			} else if ((sc.state == SCE_R_STRING && sc.ch == '\"')
+				|| (sc.state == SCE_R_STRING2 && sc.ch == '\'')
+				|| (sc.state == SCE_R_BACKTICKS && sc.ch == '`')) {
+				sc.ForwardSetState(SCE_R_DEFAULT);
+				}
+			break;
+
+		case SCE_R_ESCAPESEQUENCE:
+			if (escapeSeq.atEscapeEnd(sc.ch)) {
+				if (escapeSeq.brace && sc.ch == '}') {
 					sc.Forward();
 				}
-			} else if (sc.ch == '\"') {
-				sc.ForwardSetState(SCE_R_DEFAULT);
+				sc.SetState(escapeSeq.outerState);
+				continue;
 			}
-		} else if (sc.state == SCE_R_INFIX) {
+			break;
+
+		case SCE_R_RAWSTRING:
+		case SCE_R_RAWSTRING2:
+			while (sc.ch == matchingDelimiter) {
+				sc.Forward();
+				int count = dashCount;
+				while (count != 0 && sc.ch == '-') {
+					--count;
+					sc.Forward();
+				}
+				if (count == 0 && sc.ch == ((sc.state == SCE_R_RAWSTRING) ? '\"' : '\'')) {
+					matchingDelimiter = 0;
+					dashCount = 0;
+				sc.ForwardSetState(SCE_R_DEFAULT);
+					break;
+			}
+			}
+			break;
+
+		case SCE_R_INFIX:
 			if (sc.ch == '%') {
 				sc.ForwardSetState(SCE_R_DEFAULT);
 			} else if (sc.atLineEnd) {
 				sc.ChangeState(SCE_R_INFIXEOL);
-				sc.ForwardSetState(SCE_R_DEFAULT);
-			}
-		}else if (sc.state == SCE_R_STRING2) {
-			if (sc.ch == '\\') {
-				if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
-					sc.Forward();
 				}
-			} else if (sc.ch == '\'') {
-				sc.ForwardSetState(SCE_R_DEFAULT);
+			break;
+
+		case SCE_R_INFIXEOL:
+			if (sc.atLineStart) {
+				sc.SetState(SCE_R_DEFAULT);
 			}
+			break;
 		}
 
 		// Determine if a new state should be entered.
 		if (sc.state == SCE_R_DEFAULT) {
 			if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
 				sc.SetState(SCE_R_NUMBER);
+				if (sc.ch == '0' && AnyOf(sc.chNext, 'x', 'X')) {
+					sc.Forward();
+				}
+			} else if (AnyOf(sc.ch, 'r', 'R') && AnyOf(sc.chNext, '\"', '\'')) {
+				const int chNext = sc.chNext;
+				matchingDelimiter = CheckRawString(styler, sc.currentPos + 2, dashCount);
+				if (matchingDelimiter) {
+					sc.SetState((chNext == '\"') ? SCE_R_RAWSTRING : SCE_R_RAWSTRING2);
+					sc.Forward(dashCount + 2);
+				} else {
+					// syntax error
+					sc.SetState(SCE_R_IDENTIFIER);
+					sc.ForwardSetState((chNext == '\"') ? SCE_R_STRING : SCE_R_STRING2);
+				}
 			} else if (IsAWordStart(sc.ch) ) {
 				sc.SetState(SCE_R_IDENTIFIER);
 			} else if (sc.Match('#')) {
@@ -136,10 +261,17 @@ static void ColouriseRDoc(Sci_PositionU startPos, Sci_Position length, int initS
 				sc.SetState(SCE_R_INFIX);
 			} else if (sc.ch == '\'') {
 				sc.SetState(SCE_R_STRING2);
+			} else if (sc.ch == '`') {
+				sc.SetState(SCE_R_BACKTICKS);
 			} else if (IsAnOperator(sc.ch)) {
 				sc.SetState(SCE_R_OPERATOR);
 			}
 		}
+
+		if (sc.atLineEnd) {
+			const int lineState = matchingDelimiter | (dashCount << 8);
+			styler.SetLineState(sc.currentLine, lineState);
+		}
 	}
 	sc.Complete();
 }
@@ -147,11 +279,11 @@ static void ColouriseRDoc(Sci_PositionU startPos, Sci_Position length, int initS
 // Store both the current line's fold level and the next lines in the
 // level store to make it easy to pick up with each increment
 // and to make it possible to fiddle the current level for "} else {".
-static void FoldRDoc(Sci_PositionU startPos, Sci_Position length, int, WordList *[],
+void FoldRDoc(Sci_PositionU startPos, Sci_Position length, int, WordList *[],
                        Accessor &styler) {
-	bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
-	bool foldAtElse = styler.GetPropertyInt("fold.at.else", 0) != 0;
-	Sci_PositionU endPos = startPos + length;
+	const bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
+	const bool foldAtElse = styler.GetPropertyInt("fold.at.else", 0) != 0;
+	const Sci_PositionU endPos = startPos + length;
 	int visibleChars = 0;
 	Sci_Position lineCurrent = styler.GetLine(startPos);
 	int levelCurrent = SC_FOLDLEVELBASE;
@@ -162,11 +294,11 @@ static void FoldRDoc(Sci_PositionU startPos, Sci_Position length, int, WordList
 	char chNext = styler[startPos];
 	int styleNext = styler.StyleAt(startPos);
 	for (Sci_PositionU i = startPos; i < endPos; i++) {
-		char ch = chNext;
+		const char ch = chNext;
 		chNext = styler.SafeGetCharAt(i + 1);
-		int style = styleNext;
+		const int style = styleNext;
 		styleNext = styler.StyleAt(i + 1);
-		bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
+		const bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
 		if (style == SCE_R_OPERATOR) {
 			if (ch == '{') {
 				// Measure the minimum before a '{' to allow
@@ -203,15 +335,15 @@ static void FoldRDoc(Sci_PositionU startPos, Sci_Position length, int, WordList
 }
 
 
-static const char * const RWordLists[] = {
+const char * const RWordLists[] = {
             "Language Keywords",
             "Base / Default package function",
             "Other Package Functions",
             "Unused",
             "Unused",
-            0,
+		nullptr,
         };
 
-
+}
 
 LexerModule lmR(SCLEX_R, ColouriseRDoc, "r", FoldRDoc, RWordLists);
diff --git a/lexilla/lexlib/CharacterSet.h b/lexilla/lexlib/CharacterSet.h
index 691ca4b39..cc197ac64 100644
--- a/lexilla/lexlib/CharacterSet.h
+++ b/lexilla/lexlib/CharacterSet.h
@@ -93,6 +93,16 @@ constexpr bool IsADigit(int ch) noexcept {
 	return (ch >= '0') && (ch <= '9');
 }
 
+constexpr bool IsAHeXDigit(int ch) noexcept {
+	return (ch >= '0' && ch <= '9')
+		|| (ch >= 'A' && ch <= 'F')
+		|| (ch >= 'a' && ch <= 'f');
+}
+
+constexpr bool IsAnOctalDigit(int ch) noexcept {
+	return ch >= '0' && ch <= '7';
+}
+
 constexpr bool IsADigit(int ch, int base) noexcept {
 	if (base <= 10) {
 		return (ch >= '0') && (ch < '0' + base);
diff --git a/lexilla/lexlib/LexAccessor.cxx b/lexilla/lexlib/LexAccessor.cxx
index 0229e4757..f0d6bdf82 100644
--- a/lexilla/lexlib/LexAccessor.cxx
+++ b/lexilla/lexlib/LexAccessor.cxx
@@ -58,7 +58,7 @@ std::string LexAccessor::GetRange(Sci_PositionU startPos_, Sci_PositionU endPos_
 	assert(startPos_ < endPos_);
 	const Sci_PositionU len = endPos_ - startPos_;
 	std::string s(len, '\0');
-	GetRange(startPos_, endPos_, s.data(), len);
+	GetRange(startPos_, endPos_, s.data(), len + 1);
 	return s;
 }
 
@@ -66,7 +66,7 @@ std::string LexAccessor::GetRangeLowered(Sci_PositionU startPos_, Sci_PositionU
 	assert(startPos_ < endPos_);
 	const Sci_PositionU len = endPos_ - startPos_;
 	std::string s(len, '\0');
-	GetRangeLowered(startPos_, endPos_, s.data(), len);
+	GetRangeLowered(startPos_, endPos_, s.data(), len + 1);
 	return s;
 }
 
diff --git a/lexilla/src/Lexilla/Info.plist b/lexilla/src/Lexilla/Info.plist
index 049a78236..bdb52e490 100644
--- a/lexilla/src/Lexilla/Info.plist
+++ b/lexilla/src/Lexilla/Info.plist
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
 	<key>CFBundleShortVersionString</key>
-	<string>5.1.9</string>
+	<string>5.2.0</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>NSHumanReadableCopyright</key>
diff --git a/lexilla/src/Lexilla/Lexilla.xcodeproj/project.pbxproj b/lexilla/src/Lexilla/Lexilla.xcodeproj/project.pbxproj
index 49ccfe4a1..1a9ea35c8 100644
--- a/lexilla/src/Lexilla/Lexilla.xcodeproj/project.pbxproj
+++ b/lexilla/src/Lexilla/Lexilla.xcodeproj/project.pbxproj
@@ -875,7 +875,7 @@
 			buildSettings = {
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++17";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 5.1.9;
+				CURRENT_PROJECT_VERSION = 5.2.0;
 				DEVELOPMENT_TEAM = 4F446KW87E;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -901,7 +901,7 @@
 			buildSettings = {
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++17";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 5.1.9;
+				CURRENT_PROJECT_VERSION = 5.2.0;
 				DEVELOPMENT_TEAM = 4F446KW87E;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
diff --git a/lexilla/src/LexillaVersion.rc b/lexilla/src/LexillaVersion.rc
index b6426c358..2f7dad5f8 100644
--- a/lexilla/src/LexillaVersion.rc
+++ b/lexilla/src/LexillaVersion.rc
@@ -4,8 +4,8 @@
 
 #include <windows.h>
 
-#define VERSION_LEXILLA "5.1.9"
-#define VERSION_WORDS 5, 1, 9, 0
+#define VERSION_LEXILLA "5.2.0"
+#define VERSION_WORDS 5, 2, 0, 0
 
 VS_VERSION_INFO VERSIONINFO
 FILEVERSION	VERSION_WORDS
diff --git a/lexilla/version.txt b/lexilla/version.txt
index 82cf07969..e157b5b5f 100644
--- a/lexilla/version.txt
+++ b/lexilla/version.txt
@@ -1 +1 @@
-519
\ No newline at end of file
+520
\ No newline at end of file
diff --git a/src/StyleLexers/styleLexPS.c b/src/StyleLexers/styleLexPS.c
index 0a33b1479..d341e6426 100644
--- a/src/StyleLexers/styleLexPS.c
+++ b/src/StyleLexers/styleLexPS.c
@@ -60,7 +60,7 @@ EDITLEXER lexPS =
     &KeyWords_PS, {
         { {STYLE_DEFAULT}, IDS_LEX_STR_63126, L"Default", L"", L"" },
         //{ {SCE_POWERSHELL_DEFAULT}, IDS_LEX_STR_63126, L"Default", L"", L"" },
-        { {MULTI_STYLE(SCE_POWERSHELL_COMMENT,SCE_POWERSHELL_COMMENTSTREAM,0,0)}, IDS_LEX_STR_63127, L"Comment", L"fore:#646464", L"" },
+        { {MULTI_STYLE(SCE_POWERSHELL_COMMENT,SCE_POWERSHELL_COMMENTSTREAM,SCE_POWERSHELL_COMMENTDOCKEYWORD,0)}, IDS_LEX_STR_63127, L"Comment", L"fore:#646464", L"" },
         { {SCE_POWERSHELL_KEYWORD}, IDS_LEX_STR_63128, L"Keyword", L"bold; fore:#804000", L"" },
         { {SCE_POWERSHELL_IDENTIFIER}, IDS_LEX_STR_63129, L"Identifier", L"", L"" },
         { {MULTI_STYLE(SCE_POWERSHELL_STRING,SCE_POWERSHELL_CHARACTER,0,0)}, IDS_LEX_STR_63131, L"String", L"fore:#008000", L"" },
@@ -69,6 +69,7 @@ EDITLEXER lexPS =
         { {SCE_POWERSHELL_VARIABLE}, IDS_LEX_STR_63249, L"Variable", L"fore:#0A246A", L"" },
         { {MULTI_STYLE(SCE_POWERSHELL_CMDLET,SCE_POWERSHELL_FUNCTION,0,0)}, IDS_LEX_STR_63250, L"Cmdlet", L"fore:#804000; back:#FFF1A8", L"" },
         { {SCE_POWERSHELL_ALIAS}, IDS_LEX_STR_63251, L"Alias", L"bold; fore:#0A246A", L"" },
+        //{ {MULTI_STYLE(SCE_POWERSHELL_HERE_STRING,SCE_POWERSHELL_HERE_CHARACTER,0,0)}, IDS_LEX_STR_63131, L"Here String", L"fore:#008000", L"" },
         EDITLEXER_SENTINEL
     }
 };
diff --git a/src/StyleLexers/styleLexR.c b/src/StyleLexers/styleLexR.c
index bca4b08e3..c89b96dc9 100644
--- a/src/StyleLexers/styleLexR.c
+++ b/src/StyleLexers/styleLexR.c
@@ -87,6 +87,9 @@ EDITLEXER lexR =
         { {SCE_R_IDENTIFIER}, IDS_LEX_STR_63129, L"Identifier", L"", L"" },
         { {SCE_R_INFIX}, IDS_LEX_STR_63269, L"Infix", L"fore:#660066", L"" },
         { {SCE_R_INFIXEOL}, IDS_LEX_STR_63270, L"Infix EOL", L"fore:#FF4000; back:#E0C0E0; eolfilled", L"" },
+        { {SCE_R_BACKTICKS}, IDS_LEX_STR_63397, L"Backticks", L"fore:#3C6CDD", L"" },
+        { {MULTI_STYLE(SCE_R_RAWSTRING,SCE_R_RAWSTRING2,0,0)}, IDS_LEX_STR_63301, L"Literal String", L"italic; fore:#3C6CDD", L"" },
+        { {SCE_R_ESCAPESEQUENCE}, IDS_LEX_STR_63366, L"ESC Sequence", L"fore:#0080C0", L"" },
         EDITLEXER_SENTINEL
     }
 };