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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
RRP £29.95 ($39.95)

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Reference to nonexistent named group in regex; marked by <-- HERE in m/%s/

(F) You used something like \k'NAME' or \k<NAME> in your regular expression, but there is no corresponding named capturing parentheses such as (?'NAME'...) or (?<NAME...). Check if the name has been spelled correctly both in the backreference and the declaration.

The <-- HERE shows in the regular expression about where the problem was discovered.

ISBN 9781906966027Perl Language Reference ManualSee the print edition