Re: Regular expressions and sort


Syntactic Confectionery Delight
	PerlMonks

by Fletch (Bishop)

on Nov 04, 2005 at 13:56 UTC ( [id://505698]=note: print w/replies, xml )

Need Help??

Erm, why not just use an ST and do the matching once and not worry about clobbering $1 et al. More efficient to boot.

my @result = map { $_->[0] }
                      sort { $a->[1] <=> $b->[1] }
                      map { /_(\d{2})_/; [ $_, $1 ] } @f;
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Re^2: Regular expressions and sort by zaro (Novice) on Nov 04, 2005 at 14:14 UTC
Thanks, your solution seems better. I will use it :-). But it still doesn't explain the strange behaviour of m//.	[reply]
Re^3: Regular expressions and sort by Fletch (Bishop) on Nov 04, 2005 at 14:22 UTC
No, because `perldoc perlre` explains that: The numbered variables ($1, $2, $3, etc.) and the related punctuation set ($+, $&, $`, $', and $^N) are all dynamically scoped until the end of the enclosing block or until the next successful match, whichever comes first. (See "Compound Statements" in perlsyn.)	[reply] [d/l]

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