irata wrote: > > can someone explain me, why this short regex don't give the result I > expect: > > perl -e '$text = "(7) 32"; printf "[%s][%s]\n", ( $text =~ /\((\d+) > \)\s+(\d+)/ )' > > I supposed that the output is "[7][32]", but the output is "[][]". I > don't know why...
Your regular expression isn't matching the object string. If you had written a Perl script and added use strict; use warnings; you would have seen the warning message 'Use of uninitialized value in printf' which shows that the captures have failed. You should really check the success of a pattern match before you use the captured data, so something like this use strict; use warnings; my $text = "(7) 32"; $text =~ /\((\d+) \)\s+(\d+)/ or die; printf "[%s][%s]\n", $1, $2; Because your email client has wrapped the source line with the regular expression I cannot be certain why the match failed, but I would guess that the regular expression insists on a single space character after the string of digits within the parentheses. Your string has no space there so the match fails. Changing the regex to this /\((\d+)\)\s+(\d+)/ will give you the result you expect, although I have no way of knowing whether that is the right pattern for you to use. HTH, Rob -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
