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Geplaatst door: Erwin van den Boom, TargetMedia

4 reacties

PHP: preg_replace and preg_match

For those who don't want to read themselves into the regular expression syntax I have made a brief compilation of useful snippets in PHP:

Strip unwanted characters

Remove all special characters, except alphabetical (case-insensitive):

$output = preg_replace("/[^a-z]/i", "", $input);

Remove all except digits and alphabetical characters (case-insensitive):

$output = preg_replace("/[^a-z\d]/i", "", $input);

Remove all except digits, alphabetical and spaces (case-insensitive):

$output = preg_replace("/[^a-z \d]/i", "", $input);

Remove excess spaces:

$output = preg_replace('/\s\s+/', ' ', $input);

Make clickable

Make an URL clickable:

$output = preg_replace("#([\t\r\n ])([a-z0-9]+?){1}://([\w\-]+\.([\w\-]+\.)*[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*)?)#i", '\1<a href="\2://\3" target="_blank" rel="nofollow">\3</a>', $input);
$output = preg_replace("#([\t\r\n ])(www)\.(([\w\-]+\.)*[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*)?)#i", '\1<a href="http://\2.\3" rel="nofollow" target="_blank">\2.\3</a>', $input);

Make e-mailaddresses clickable:

$output = preg_replace("#([\n ])([a-z0-9\-_.]+?)@([\w\-]+\.([\w\-\.]+\.)*[\w]+)#i", "\\1<a href=\"mailto:\\2@\\3\" class=orange>\\2@\\3</a>", $input);

Validation functions

To test if an e-mailaddress is valid:

$test = preg_match("/^[a-z0-9_\.-]+@([a-z0-9]+([\-]+[a-z0-9]+)*\.)+[a-z]{2,7}$/i", $input);

To test if an URL is valid:

$test = preg_match('/(https?:\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/i', $input);

Feel free to leave your own useful reg-ex patterns in the comments!


Geplaatst: 21 okt 2008 19:32	Categorie: Scripting en webdesign	Bekeken: 11.444 keer

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PHP: preg_replace and preg_match