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perldiag: Update description for regex group names

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This was written before Unicode, and its wording does not accurately
extend beyond ASCII.

This commit clarifies the description.
This commit is contained in:
Karl Williamson 2025-10-25 09:21:55 -06:00 committed by Karl Williamson
parent 54a6582cfa
commit 291e398846
1 changed files with 13 additions and 3 deletions
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pod/perldiag.pod
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@ -2881,9 +2881,19 @@ has since been undefined.
=item Group name must start with a non-digit word character in regex; marked by
S<<-- HERE> in m/%s/
(F) Group names must follow the rules for perl identifiers, meaning
they must start with a non-digit word character. A common cause of
this error is using (?&0) instead of (?0). See L<perlre>.
(F) Group names must follow the rules for Perl identifiers, meaning
they must start with a character that matches C<\p{XID_Start}> plus the
underscore. This means the first character may not be a digit.
Subsequent characters must match C<\p{XID_Continue}>.
A common cause of this error is using (?&0) instead of (?0).
This message was formulated before Perl supported Unicode; so it is
not accurate for Unicode characters outside the ASCII-range. There are
many word characters in Unicode that may not start a group name, and a
few that may not be a continuation character.
See L<perlre>.
=item ()-group starts with a count