preg replace error

[Glenskie]

i keep getting this at top of page

Warning: preg_replace() [function.preg-replace]: No ending delimiter '`' found in C:\xampp\htdocs\socialtscripts\activation.php on line 16

here is the code that it is reffering to

preg_replace("`", "", $id);

[codeprada]

Your regular expression should be enclosed in delimiters. A delimiter would be any character used to determine the beginning and end of the regular expression.

Example - # would be the delimiter

'#regex_here#'