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( #3333=superdoc: print w/replies, xml ) Need Help??

I don't know how it compares for speed — probably slower due to the sub calls — but here's an alternative.

use strict; use warnings; use re 'eval'; # Should be scoped better. sub rc($) { my $ofs = @- + shift; return substr($_, $-[$ofs], $+[$ofs] - $-[$ofs]) } sub compile_pat { qr/$_[0]/ } my @s_months = qw( Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ); my $s_months = compile_pat join '|', @s_months; local our %s_months = map { $s_months[$_] => $_+1 } 0..$#s_months; my @pats = ( qr/ (\d{4})-(\d{2})-(\d{2}) (?{[ rc-3, rc-2, rc-1 ]})/x, qr/ (\d{2})($s_months)(\d{4}) (?{[ rc-1, $s_months{rc-2}, rc-3 ]})/x, ); my $pat = compile_pat join '|', @pats; for (qw( 2009-12-01 01Dec2009 01-12-2009 )) { local our ($y,$m,$d); if (/$pat(?{ ($y,$m,$d) = @{$^R} })/) { printf("%s => %04d-%02d-%02d\n", $_,$y,$m,$d); } else { printf("%s => [No match]\n", $_); } }

Bonus: $pat can be calculated once and stored in a file.


In reply to Re^7: Speeding up named capture buffer access by ikegami
in thread Speeding up named capture buffer access by SBECK

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