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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 group in regex; marked by <-- HERE in m/%s/

(F) You used something like \7 in your regular expression, but there are not at least seven sets of capturing parentheses in the expression. If you wanted to have the character with value 7 inserted into the regular expression, prepend a zero to make the number at least two digits: \07

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

ISBN 9781906966027Perl Language Reference ManualSee the print edition