Fix replacement bug in pcre2_substitute().

ChangeLog

@@ -72,6 +72,10 @@ but would not set (an example does exist), the test would "pass" without
 actually doing anything. Also the fr_CA locale has been added to the list of 
 locales that can be used.
 
+14. Fixed a bug in pcre2_substitute(). If a replacement string ended in a
+capturing group number without parentheses, the last character was incorrectly
+literally included at the end of the replacement string.
+
 
 Version 10.00 05-January-2015
 -----------------------------

src/pcre2_substitute.c

@@ -226,9 +226,9 @@ do
       if (next >= CHAR_0 && next <= CHAR_9)
         {
         group = next - CHAR_0;
-        while (i < rlength - 1)
+        while (++i < rlength)
           {
-          next = replacement[++i];
+          next = replacement[i];
           if (next < CHAR_0 || next > CHAR_9) break;
           group = group * 10 + next - CHAR_0;
           }

testdata/testinput2

@@ -4076,6 +4076,18 @@ a random value. /Ix
 /(?<=abc)(|def)/g,replace=<$0>
     123abcxyzabcdef789abcpqr
     
+/./replace=$0
+    a
+    
+/(.)(.)/replace=$2+$1
+    abc
+    
+/(?<A>.)(?<B>.)/replace=$B+$A
+    abc
+    
+/(.)(.)/g,replace=$2$1
+    abcdefgh  
+
 # End of substitute tests 
 
 "((?=(?(?=(?(?=(?(?=()))))))))"

testdata/testoutput2

@@ -13722,6 +13722,22 @@ Failed: error -34: bad option value
     123abcxyzabcdef789abcpqr
  4: 123abc<>xyzabc<><def>789abc<>pqr
     
+/./replace=$0
+    a
+ 1: a
+    
+/(.)(.)/replace=$2+$1
+    abc
+ 1: b+ac
+    
+/(?<A>.)(?<B>.)/replace=$B+$A
+    abc
+ 1: b+ac
+    
+/(.)(.)/g,replace=$2$1
+    abcdefgh  
+ 4: badcfehg
+
 # End of substitute tests 
 
 "((?=(?(?=(?(?=(?(?=()))))))))"