Bug #53728 [Com]: Recursive Reference or Repetition Don't Works

Edit report at http://bugs.php.net/bug.php?id=53728&edit=1 ID: 53728 Comment by: i at WalkinRaven dot name Reported by: i at WalkinRaven dot name Summary: Recursive Reference or Repetition Don't Works Status: Bogus Type: Bug Package: PCRE related Operating System: Ubuntu 11.04 PHP Version: 5.3SVN-2011-01-12 (SVN) Block user comment: N Private report: N New Comment: No, I think this is a bug, for if you just remove all references, like changing regular expression to: /^ ( [a-z] | # One-letter domain name [a-z] [a-z 0-9] | # Two-letters domain name [a-z] ([a-z 0-9 \-]){1,61} [a-z 0-9] # More-letters domain name ) (\. ( [a-z] | # One-letter domain name [a-z] [a-z 0-9] | # Two-letters domain name [a-z] ([a-z 0-9 \-]){1,61} [a-z 0-9] # More-letters domain name ))*? # More labels \.? # Root domain name $/Dix All others are not changed, you will get the right result. P.S. in original I've written a mistake for "(\. (?P>label))*+ # More labels" should be "(\. (?P>label))*? # More labels". Previous Comments: ------------------------------------------------------------------------ [2011-01-12 22:55:40] felipe@php.net Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Due to the volume of reports we can not explain in detail here why your report is not a bug. The support channels will be able to provide an explanation for you. Thank you for your interest in PHP. ------------------------------------------------------------------------ [2011-01-12 18:25:27] i at WalkinRaven dot name Description: ------------ PCRE 8.02 2010-03-19 I use the code below to validate domain names according to RFC 1034 3.5 http://www.rfc-editor.org/rfc/rfc1034.txt This rules is: <domain> ::=<subdomain> | " " <subdomain> ::=<label> |<subdomain> "."<label> <label> ::=<letter> [ [<ldh-str> ]<let-dig> ] <ldh-str> ::=<let-dig-hyp> |<let-dig-hyp> <ldh-str> <let-dig-hyp> ::=<let-dig> | "-" <let-dig> ::=<letter> |<digit> <letter> ::= any one of the 52 alphabetic characters A through Z in upper case and a through z in lower case <digit> ::= any one of the ten digits 0 through 9 I've checked my pattern many times, and guess there may something wrong with PCRE. Test script: --------------- $domain = 'www.WalkinRaven.name'; $result = \preg_match ( '/^ (?P<label> (?P<letter>[a-z]) | # One-letter domain name (?P>letter) (?P<let_dig>[a-z 0-9]) | # Two-letters domain name (?P>letter) (?P<ldh_str>[a-z 0-9 \-]){1,61} (?P>let_dig) # More-letters domain name ) (\. (?P>label))*+ # More labels \.? # Root domain name $/Dix', $domain ); echo $result; Expected result: ---------------- 1 Actual result: -------------- 0 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=53728&edit=1