PHP正则表达式:在中找不到结尾定界符'^' [英] PHP regular expressions: No ending delimiter '^' found in

问题描述

我在使用正则表达式时遇到了麻烦.

I've been having some trouble with regular expressions.

这是我的代码

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

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

我运行它并得到:

警告:preg_match()[function.preg-match]:在

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

推荐答案

PHP正则表达式字符串需要定界符.试试:

PHP regex strings need delimiters. Try:

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

此外，请注意，您使用的是小写字母o，而不是零.另外，如果您只是进行验证，则不需要捕获组，并且可以将正则表达式简化为/^\d+$/.

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+$/.

示例: http://ideone.com/Ec3zh

另请参见: PHP-分隔符

See also: PHP - Delimiters

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