Stripping everything but alphanumeric chars from a string in PHP

Question

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 ,@#

Answer 1

Try:

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

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