diff --git a/Versions/build.txt b/Versions/build.txt
index 0cfbf0888..d00491fd7 100644
--- a/Versions/build.txt
+++ b/Versions/build.txt
@@ -1 +1 @@
-2
+1
diff --git a/Versions/day.txt b/Versions/day.txt
index a817176f4..0ddd619ce 100644
--- a/Versions/day.txt
+++ b/Versions/day.txt
@@ -1 +1 @@
-216
+217
diff --git a/res/Notepad3.exe.manifest.conf b/res/Notepad3.exe.manifest.conf
index 6e1459e78..9f1f274ec 100644
--- a/res/Notepad3.exe.manifest.conf
+++ b/res/Notepad3.exe.manifest.conf
@@ -3,7 +3,7 @@
   <assemblyIdentity
     name="Notepad3"
     processorArchitecture="*"
-    version="5.20.216.2"
+    version="5.20.217.1"
     type="win32"
   />
   <description>Notepad3 RC1</description>
diff --git a/scioniguruma/OnigurumaRegExEngine.cxx b/scioniguruma/OnigurumaRegExEngine.cxx
index 8c4390e55..511ee148a 100644
--- a/scioniguruma/OnigurumaRegExEngine.cxx
+++ b/scioniguruma/OnigurumaRegExEngine.cxx
@@ -400,8 +400,6 @@ const char* OnigurumaRegExEngine::SubstituteByPosition(Document* doc, const char
 
   m_SubstBuffer.clear();
 
-  //TODO: allow for arbitrary number of groups/regions
-
   for (size_t j = 0; j < rawReplStrg.length(); j++) 
   {
     bool bReplaced = false;
@@ -409,7 +407,9 @@ const char* OnigurumaRegExEngine::SubstituteByPosition(Document* doc, const char
     {
       if ((rawReplStrg[j + 1] >= '0') && (rawReplStrg[j + 1] <= '9'))
       {
-        int const grpNum = rawReplStrg[j + 1] - '0';
+        // group # limit = 99 / TODO: allow for arbitrary number of groups/regions
+        bool const num2nd = ((rawReplStrg[j + 2] >= '0') && (rawReplStrg[j + 2] <= '9'));
+        int const grpNum = num2nd ? (rawReplStrg[j + 1] - '0') * 10 + (rawReplStrg[j + 2] - '0') : (rawReplStrg[j + 1] - '0');
         if (grpNum < m_Region.num_regs)
         {
           auto const rBeg = SciPos(m_Region.beg[grpNum]);
@@ -418,13 +418,13 @@ const char* OnigurumaRegExEngine::SubstituteByPosition(Document* doc, const char
           m_SubstBuffer.append(doc->RangePointer(rBeg, len), static_cast<size_t>(len));
         }
         bReplaced = true;
-        ++j;
+        j += num2nd ? 2 : 1;
       }
       else if (rawReplStrg[j] == '$')
       {
         size_t k = ((rawReplStrg[j + 1] == '+') && (rawReplStrg[j + 2] == '{')) ? (j + 3) : ((rawReplStrg[j + 1] == '{') ? (j + 2) : 0);
         if (k > 0) {
-          // named group replacemment
+          // named group replacement
           auto const name_beg = UCharCPtr(&(rawReplStrg[k]));
           while (rawReplStrg[k] &&  IsCharAlphaNumericA(rawReplStrg[k])) { ++k; }
           if (rawReplStrg[k] == '}')
@@ -567,6 +567,8 @@ std::string& OnigurumaRegExEngine::convertReplExpr(std::string& replStr)
         // former behavior convenience: 
         // change "\\<n>" to deelx's group reference ($<n>)
         tmpStr.push_back('$');
+        tmpStr.push_back(ch);
+        continue;
       }
       switch (ch) {
         // check for escape seq:
@@ -574,10 +576,7 @@ std::string& OnigurumaRegExEngine::convertReplExpr(std::string& replStr)
         tmpStr.push_back('\a');
         break;
       case 'b':
-        tmpStr.push_back('\b');
-        break;
-      case '\x1B':
-        tmpStr.push_back('\e');
+        tmpStr.push_back('\x1B');
         break;
       case 'f':
         tmpStr.push_back('\f');
diff --git a/src/VersionEx.h b/src/VersionEx.h
index 0510c0026..e28d7bd83 100644
--- a/src/VersionEx.h
+++ b/src/VersionEx.h
@@ -8,12 +8,12 @@
 #define SAPPNAME "Notepad3"
 #define VERSION_MAJOR 5
 #define VERSION_MINOR 20
-#define VERSION_REV 216
-#define VERSION_BUILD 2
+#define VERSION_REV 217
+#define VERSION_BUILD 1
 #define SCINTILLA_VER 430
 #define ONIGURUMA_REGEX_VER 6.9.4
 #define UCHARDET_VER 2018.09.27
 #define TINYEXPR_VER 2018.05.11
 #define UTHASH_VER 2.1.0
 #define VERSION_PATCH RC1
-#define VERSION_COMMIT_ID nebukadn
+#define VERSION_COMMIT_ID t7820-rk