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

Question

I\'ve been having some trouble with regular expressions.

This is my code

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

if (preg_match($pattern, $input))
   echo \"yes         


        

Answer 1

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