Regular to determine whether the site link address
Title for example to determine the site link format is a normal link http://bbs.csdn.net/topics/new?forum_id=PHPBase
Share to:
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Echo Filter_var ("Http://bbs.csdn.net/topics/new?forum_id=PHPBase", Filter_validate_url);
Http://bbs.csdn.net/topics/new?forum_id=PHPBase
Echo Filter_var ("Http:bbs.csdn.net/topics/new?forum_id=phpbase", Filter_validate_url);
Empty
See also: http://de3.php.net/manual/en/function.filter-var.php
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It works better upstairs, if you need a regular.
$reg = '/\b ((? #protocol) https?
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FTP): \/\/((? #domain) [-a-z0-9.] +) ((? #file) \/[-a-z0-9+&@#\/%=~_
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!:,.;] *)? ((? #parameters) \? [A-z0-9+&@#\/%=~_
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!:,.;] *)?/I ';
