Remove all but valid characters

Question

Valid characters include the alphabet (abcd..), numbers (0123456789), spaces, ' and ".

I need to strip any other characters than these from a string in PHP.

Thanks :)

Answer 1

You can do this:

$str = preg_replace('/[^a-z0-9 "\']/', '', $str);

Here the character class [^a-z0-9 "'] will match any character except the listed ones (note the inverting ^ at the begin of the character class) that are then replaced by an empty string.