PHP正则表达式，带有特定字词_my_separator_

Question

Please I have I want to use regex to preg_match this kind of string :

$liste = 'bla0bla-__my_separator_-01blabla';

I've tried :

if(preg_match('/^[a-zA-Z0-9]_my_separator_[a-zA-Z0-9]$/', $liste))
     echo 'ok';
else echo 'not ok';

But this returns always not ok .

Please masters any advise ?

PS : I think that the problem is the _ and the - that what I've tried does not support !

Thanks in advance.

Answer 1

将您的正则表达式模式更改为此：

'/^[a-zA-Z0-9_\-]+?_my_separator_[a-zA-Z0-9_\-]+?$/'

Answer 2

If you're only trying to determine if a static substring exists in a string you should use strpos() :

if (strpos('_my_separator_', $liste) !== false) {
  echo 'ok';
}

Answer 3

You're missing the repeater + and - and _ in your whitelists:

/^[a-zA-Z0-9\\-_]+_my_separator_[a-zA-Z0-9\\-_]+$/

Your orignal regex would match things like:

A_my_seperator_B
0_my_seperator_C

but not:

AB_my_seperator_C