Re: Calculating variable {n} in regex match

I learned this here at PerlMonks: you can execute an expression inside a string or a regex pattern by wrapping it in @{[]}, like so:

#!/usr/bin/env perl
use Modern::Perl;

my $str = 'abc123efghijk';
my $i = 2;

if( $str =~ /(\d{@{[$i+1]}})/ ){
    say $1;
}
# output -> 123
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Aaron B.
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Re^2: Calculating variable {n} in regex match by atreyu (Sexton) on Jun 18, 2012 at 16:59 UTC
nice, aaron. `my $rc = ($foo =~ /^(\d{@{[$i+1]}})$/` always w/Perl, TIMTOWTDI...	[reply] [d/l]