Dynamic Regex

The example doesn't have to make sense, but Im looking for the correct syntax for $foo. I was trying -> $foo = '\[this\](.*?)that'; $bar = 'the other'; $str = preg_replace($foo, $bar, $other_string); But that doesn't work. I came across an example where the syntax of $foo is in -> $foo = '#\[this\](.*?)that#'; The second syntax of $foo works. I was wondering on the meaning of # in the string?? Thanks -- Gerard Samuel http://www.trini0.org:81/ http://dev.trini0.org:81/