Question

I am wanting to replace all non letter and number characters i.e. /&%#$ etc with an underscore (_) and replace all ' (single quotes) with ““blank (so no underscore).

So “There wouldn’t be any” (ignore the double quotes) would become “There_wouldnt_be_any“.

I am useless at reg expressions hence the post.

Cheers

Answer 1

$newstr = preg_replace('/[^a-zA-Z0-9\']/', '_', "There wouldn't be any");
$newstr = str_replace("'", '', $newstr);

I put them on two separate lines to make the code a little more clear.

Note: If you’re looking for Unicode support, see Filip’s answer below. It will match all characters that register as letters in addition to A-z.