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http://bugs.exim.org/show_bug.cgi?id=1583
Summary: Substitution inserting extra character
Product: PCRE
Version: 10.00 (PCRE2)
Platform: Other
OS/Version: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
AssignedTo: ph10@???
ReportedBy: carinom@???
CC: pcre-dev@???
If a replacement string ends in a capturing group number without parentheses,
the last character is literally included at the end of the replacement string.
I have found this to occur with any number of capture groups, including 0 and
10+. It also seems to occur using any character width (8/16/32). If global
substitution is enabled, it will do it for each occurrence of the pattern.
The example below is ripped from pcre2test, however I can confirm that the bug
exists as part of the actual pcre2_substitute() function, as this is how I
originally discovered it.
E.g.
re> /./replace=$0
data> a
1: a0
re> /(.)(.)/replace=$2+$1
data> abc
1: b+a1c
re> /(.)(.)/g,replace=$2$1
data> abcdefgh
4: ba1dc1fe1hg1
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