https://bugs.exim.org/show_bug.cgi?id=2446
Bug ID: 2446
Summary: Positive lookbehind assertions with nested assertions
behave differently in PCRE and PCRE2
Product: PCRE
Version: 10.32 (PCRE2)
Hardware: x86-64
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: p...@hermes.cam.ac.uk
Reporter: p...@etutor.pl
CC: pcre-dev@exim.org
In PHP 7.2, which uses PCRE 8.41, the following call:
preg_split("/(?<='(?!t(?<=n't)))/ui", "n't", null, PREG_SPLIT_NO_EMPTY)
returns the following array:
[
0 => n't
]
However in PHP 7.3, which uses PCRE 10.32, the result for the same call is
different:
[
0 => n',
1 => t
]
It seems that the positive lookbehind assertion is treated differently. It
looks like a bug in PCRE2, as other regular expression implementations (for
example, in Java) behave in the same way as PCRE1 for this expression.
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