https://bugs.exim.org/show_bug.cgi?id=2645
Bug ID: 2645
Summary: error when trying to substitute an optional capture
group that was not matched
Product: PCRE
Version: 10.35 (PCRE2)
Hardware: x86
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: philip.ha...@gmail.com
Reporter: plane...@gmail.com
CC: pcre-dev@exim.org
I reported a bug to the fish shell project about its "string replace" command.
The bug report was closed, and pcre2 was blamed as the source of the error.
Someone suggested creating a bug here.
https://github.com/fish-shell/fish-shell/issues/7343
Description:
The issue is that when trying to substitute a group that didn't match (because
it was optional), an error is given instead of substituting an empty string.
Steps to reproduce:
echo 'az' | string replace -r -- 'a(b.+)?z' 'a:$1z'
echo 'abz' | string replace -r -- 'a(b.+)?z' 'a:$1z'
echo 'abcz' | string replace -r -- 'a(b.+)?z' 'a:$1z'
Output:
string replace: Regular expression substitute error: requested value is not set
abz
a:bcz
I expected the first command to print
a:z
Here is an example that behaves as expected.
https://regex101.com/r/wG3aM3/931
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