Stripping everything but alphanumeric chars from a string in PHP

user_49153 0
Viewed 27123

I'd like a regexp or other string which can replace everything except alphanumeric chars (a-z and 0-9) from a string. All things such as ,@#$(@*810 should be stripped. Any ideas?

Edit: I now need this to strip everything but allow dots, so everything but a-z, 1-9, .. Ideas?

php regex string
5 Answers
$string = preg_replace("/[^a-z0-9.]+/i", "", $string);

Matches one or more characters not a-z 0-9 [case-insensitive], or "." and replaces with ""

user_919140

I like using [^[:alnum:]] for this, less room for error.

preg_replace('/[^[:alnum:]]/', '', "(ABC)-[123]"); // returns 'ABC123'
user_699590 
/[^a-z0-9.]/

should do the trick

user_128550

Try:

$string = preg_replace ('/[^a-z0-9]/i', '', $string);

/i stands for case insensitivity (if you need it, of course).

Ilya_Birman_658130
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