preg_replace() issue

[helloise]

im not sure how to do this: my code used the deprecated ereg_replace like this:
$name = ereg_replace(" ", "", $name);

i replaced it with this:
$name = preg_replace(" ", "", $name); //this is line 65

but know get a warning:
Warning: preg_replace(): Empty regular expression on line 65

what am i doing wrong please?
thank you

[bradgrafelman]

Your regexp pattern doesn't have a pattern delimiter (something PCRE requires), however there's no reason to do a regular expression find-and-replace anyway - just use [man]str_replace/man.