Remove all alphanumeric characters except spaces? [duplicate]

Question

Possible Duplicate:
Regular expression to remove anything but alphanumeric & spaces (in PHP)

I'm trying to get

//before preg_replace -> Hi (Jimmy),

$string = preg_replace('/[^\da-z]/i', '', $string);

//after current preg_replace -> HiJimmy
//what it should be -> Hi Jimmy

preg_replace removing all alphanumeric characters, except for spaces. Is this possible?

Answer 1

Just add a space to your group:

$string = preg_replace('/[^\da-z ]/i', '', $string);
//                              ^ Notice the space here