preg_match please help

[spanna128]

Hi im trying to do a registration form and i am new to using preg_match. I keep getting the error

 

"( ! ) Warning: preg_match() [function.preg-match]: No ending delimiter '^' found in C:\wamp\www\registration1.php on line 67"

 

and for every other line I use preg_match. this is an example of how i have used it

 

if (  preg_match('^[[:alnum:]\.\'\-]{4,50}$', stripslashes(trim($_POST['UserName']))) ) 
{
	$UserName = mysql_real_escape_string($_POST['UserName']);
        $query = "SELECT UserName FROM Users WHERE UserName = '$UserName'";
        $result = @mysql_query($query);
        $num = @mysql_num_rows($result);

 

im such a noob at this can someone please help me

 

I would also like to add that I have read the http://www.php.net/manual/en/function.preg-match.php page but i dont really understand it.

[xyph]

http://php.net/manual/en/regexp.reference.delimiters.php

[spanna128]

http://php.net/manual/en/regexp.reference.delimiters.php

 

I have read that too Im just not sure exacty where to put the delimiters. i have tried multiple different delimeters and im either putting them in the wrong place or closing them wrong i'm just not sure. Can you please provide an example

[xyph]

preg_match( '#[a-z]++#i', $data, $matches );

[spanna128]

preg_match( '#[a-z]++#i', $data, $matches );

 

i have solved it thanks