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Re: Pattern matching: Why no \1 in [ ]?

by MarkM (Curate)
on Aug 07, 2003 at 19:46 UTC ( #282010=note: print w/ replies, xml ) Need Help??

in reply to Pattern matching: Why no \1 in [ ]?

\1 provides the ability to substitute the literal text string of a previously matched parameter into the regular expression. It doesn't give you the ability to recompile the regular expression. Character class ([...]) are a compile time directive. \1 is a run time directive. [\1] is interpretted as 'the character with value 1'.

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