str_replace question

I have this str_replace regex:

$username="any string in english letters";
$convert = str_replace('(a-zA-Z)*?', "unknown", $username); 
echo $convert;

Code (markup):

its suppose to b like this but when I run it gives me "any string in english letters" without any replacements it should outputs only "unknown" string...

any ideas?

 

str_replace doesn't support RegEx. Use eregi_replace or preg_replace.

Jay

 

ooops...little mistake

anyway thanx a lot u saved ma a**