Help with regular expressions

Ok I am so stumped.. I'm doing something stupid and I can't figure it out.. Here's the code: <?php $eml = 'hiddenemailadddress@hiddendomain.net ceo'; if (strpos($eml, ' ')) echo "yep, there are spaces\n"; //does strpos see the spaces? echo preg_replace('/\s/', '', $eml); //WTF? Preg_replace does not? echo "$eml\n"; ?> As you can see there are a bunch of spaces in that email address. I'm trying to use preg_replace to get rid of them. Strpos sees the spaces and the first echo statement is executed. The second echo prints nothing and the third prints the original $eml with nothing substituted. Can anyone see why the perl reg isn't seeing the spaces? Carl