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| author | Yves Orton <demerphq@gmail.com> | 2022-02-20 10:38:09 +0100 |
|---|---|---|
| committer | Karl Williamson <khw@cpan.org> | 2022-02-23 10:40:52 -0700 |
| commit | 271c3af797311222713e1573330fe45bb5609e6a (patch) | |
| tree | c3657135c131acece6870b65353ee8ee64ef0760 /regcomp.sym | |
| parent | 35b3c2dce3f9235087a5114ea0abb1d6200b534a (diff) | |
| download | perl-271c3af797311222713e1573330fe45bb5609e6a.tar.gz | |
regex engine: Issue #19168 - Fix variable length lookbehind matches
We were not validating that when (?<=a|ab) matched that the right hand
side of the match lined up with the position of the assertion. Similar
for (?<!a|ab) and related patterns, eg, (*positive_lookbehind:).
Note these problems do NOT affect lookahead.
Part of the difficulty here was that the SUCCEED node was serving too
many purposes, necessitating a new regop LOOKBEHIND_END.
Includes more tests for various lookahead or lookbehind cases.
Diffstat (limited to 'regcomp.sym')
| -rw-r--r-- | regcomp.sym | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/regcomp.sym b/regcomp.sym index 510a6162be..bdf6e47551 100644 --- a/regcomp.sym +++ b/regcomp.sym @@ -282,6 +282,9 @@ CUTGROUP VERB, no-sv 1 ; On failure go to the next alternation in the #*Control what to keep in $&. KEEPS KEEPS, no ; $& begins here. +#*Validate that lookbehind IFMATCH and UNLESSM end at the right place +LOOKBEHIND_END END, no ; Return from lookbehind (IFMATCH/UNLESSM) and validate position + # NEW STUFF SOMEWHERE ABOVE THIS LINE. Stuff that regexec.c: find_byclass() # and regrepeat() use should go way above, near LNBREAK to allow a more compact # jump table to be generated for their switch() statements |