Regex to remove non alphanumeric characters from UTF8 strings

Question

How can I remove characters, like punctuation, commas, dashes etc from a string, in a multibyte safe manner?

I will be working with input from many different languag

Answer 1

Maybe this will be usefull?

$newstring = preg_replace('/[^0-9a-zA-Z\s]/', $oldstring);