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Re^2: Match nothing in grep { ! // }

by bart (Canon)
on Mar 14, 2013 at 12:07 UTC ( #1023465=note: print w/ replies, xml ) Need Help??


in reply to Re: Match nothing in grep { ! // }
in thread Match nothing in grep { ! // }

The empty regex always matches
Well, yes, and no. // is special, it serves as a shortcut, as if it's not the first regex you match, it signifies a repeat of the last regex that matched.

perlreref:

If 'pattern' is an empty string, the last successfully matched regex is used.

In your tests here, there was no previous match, so this rule doesn't apply.


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