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( #3333=superdoc: print w/replies, xml ) Need Help??
#!/usr/bin/perl # use strict; use warnings; $| = 1; sub err { die "ERROR: ", s/\G/<@_>/r, "\n" } sub crossmap { my ($left, $right) = @_; [ map { my $prefix = $_ ; map $prefix.$_, @$right } @$left ]; } sub expr { my $answer = [ '' ]; $answer = /\G(\d+)/gc ? crossmap $answer, [ $1 ] : /\G\|/gc ? [ @$answer, @{ expr() } ] : /\G\[(\d+)\]/gc ? crossmap $answer, [ split //, $1 ] : /\G\(/gc ? ( crossmap($answer, expr()), /\G\)/gc || err "missing ')'")[0] : return $answer while 1; } while(<DATA>) { chomp; print "$_ => "; my $answer = expr(); /\G\z/gc or err "incomplete parse"; local $" = ','; print "@$answer\n"; } __DATA__ (65|70) (3[678]|4[1678]) 5[45] (6[4569]|7[01])

Hey, it works for all your test cases :)

UPDATE: typo fixed

In reply to Re: Regular Expression Test by tybalt89
in thread Regular Expression Test by leoberbert

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