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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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Unknown switch condition (?(%.2s in regex; marked by <-- HERE in m/%s/

(F) The condition part of a (?(condition)if-clause|else-clause) construct is not known. The condition may be lookahead or lookbehind (the condition is true if the lookahead or lookbehind is true), a (?{...}) construct (the condition is true if the code evaluates to a true value), or a number (the condition is true if the set of capturing parentheses named by the number matched).

The <-- HERE shows in the regular expression about where the problem was discovered. See 11.

ISBN 9781906966027Perl Language Reference ManualSee the print edition