PHP regular expressions: No ending delimiter '

问题:

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

This is my code

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

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

I run it and get:

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

回答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

回答2:

Your regex pattern needs to be in delimiters:

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

回答3:

You can use T-Regx library, that doesn\'t need delimiters

pattern(\'^([0-9]+)$\')->match($input);