https://bugs.exim.org/show_bug.cgi?id=2770
Bug ID: 2770
Summary: Delimiters used within \Q..\E are marked unrecognized
Product: PCRE
Version: 10.34 (PCRE2)
Hardware: All
OS: Windows
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: Philip.Hazel@???
Reporter: onlinecop@???
CC: pcre-dev@???
If a regex delimiter is encountered within a \Q..\E block, it should be
recognized as a literal character, not as a delimiter. Below, I have specified
4 math operators: [-+*/]. Since my delimiter is a forward-slash, I started the
character group, then used \Q, then entered the raw (unescaped) math
characters, then used \E, and finally closed the character group.
PCRE2 version 10.34 2019-11-21
re> /[\Q-+*/\E]/g
** Unrecognized modifier 'E' in 'E]/g'
re> /[\Q-+*\/\E]/g
data> a+b-c/d*e\\f
0: +
0: -
0: /
0: *
0: \
data>
re> @[\Q-+*/\E]@g
data> a+b-c/d*e\\f
0: +
0: -
0: /
0: *
data>
You notice that pcre2test gives an error when attempting to use the delimiter
within \Q..\E, but accepted the pattern when I escaped it as: [-+*\/]
However, the matched string now matches the backslash character in the data,
which is not desired.
If the delimiter is changed, then the raw [-+*/] characters are accepted, and
the backslash character is not matched.
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