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Php: preg_match failed to create special character pattern

I have a problem with php regex. I have the same regex in JS and it works. I do not know what's the problem.

this is php code regex:

echo $password; // 9Gq!Q23Lne;<||.'/\
$reg_password = "/^[-_0-9a-záàâäãåçéèêëíìîïñóòôöõúùûüýÿæœÁÀÂÄÃÅÇÉÈÊËÍÌÎÏÑÓÒÔÖÕÚÙÛÜÝŸÆŒ0\d!@#$%^&*()_\+\{\}:\"<>?\|\[\];\',\.\/\x5c~]{6,30}$/i";
if(isset($password) &&
  (!preg_match($reg_password, $password) || !preg_match("#[a-z]#", $password) || !preg_match("#[\d]#", $password))
){
   echo "you failed";
 }

original password from html input:

9Gq!Q23Lne;<||.\'/\

this is the same value just before $ reg_password.

I checked the mysqli method with escape_string, but it doesn't work either:

$password = $this->db->escape_string($password);
echo $password; // 9Gq!Q23Lne;<||.\'/\\

I don't know what my problem is because I used regex101.com to test it and it works.

Any ideas about this? Thanks to

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2 answers


You don't need to call preg_match

multiple times, just use lookahead to enforce your rules, as in this regex:

^(?=.*?\d)(?=.*?[a-z])[-\wáàâäãåçéèêëíìîïñóòôöõúùûüýÿæœÁÀÂÄÃÅÇÉÈÊËÍÌÎÏÑÓÒÔÖÕÚÙÛÜÝŸÆŒ0\d!@#$%^&*()+{}:"<>?|\[\];',./\x5c~]{6,30}$

Demo version of RegEx



Code:

$re = "`^(?=.*?\\d)(?=.*?[a-z])[-\\wáàâäãåçéèêëíìîïñóòôöõúùûüýÿæœÁÀÂÄÃÅÇÉÈÊËÍÌÎÏÑÓÒÔÖÕÚÙÛÜÝŸÆŒ0\\d!@#$%^&*()+{}:\"<>?|\\[\\];',./\\x5c~]{6,30}$`mu";
$str = "9Gq!Q23Lne;<||.\'/\\"; 

if (!preg_match($re, $input)) {
   echo "you failed";
}
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You need to use single quote instead of double in your template;)

So it will be like



$reg_password = '/^[-_0-9a-záàâäãåçéèêëíìîïñóòôöõúùûüýÿæœÁÀÂÄÃÅÇÉÈÊËÍÌÎÏÑÓÒÔÖÕÚÙÛÜÝŸÆŒ0\d!@#$%^&*()_\+\{\}:\"<>?\|\[\];\',\.\/\x5c~]{6,30}$/i';
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