PHP regular expressions: No ending delimiter '^' found in

I've been having some trouble with regular expressions.

This is my code

$pattern = "^([0-9]+)$";

if (preg_match开发者_如何学运维($pattern, $input))
   echo "yes";
else
   echo "nope";

I run it and get:

Warning: preg_match() [function.preg-match]: No ending delimiter '^' found in

PHP regex strings need delimiters. Try:

$numpattern="/^([0-9]+)$/";

Also, note that you have a lower case o, not a zero. In addition, if you're just validating, you don't need the capturing group, and can simplify the regex to /^\d+$/.

Example: http://ideone.com/Ec3zh

See also: PHP - Delimiters

Your regex pattern needs to be in delimiters:

$numpattern="/^([0-9]+)$/";