preg_match限制字符串大小而不更改字符串

Question

I'm trying to validate a password input of a user using php. Now I'm trying to require the user to put at least 6 chars. it doesn't matter if it's all letters or digits or any other language chars. In fact I want it to accept special chars from different languages... so I decided not to change the string expressing but limit the length of it I used this code

public function validpassword($value,$fields = NULL ,$reports = NULL){
global $reports;
if(preg_match($value, "/{6,24}/")){
return $value;
}else{
$reports[] = $fields.": 6-24 chars limit";
return false;
}
}

it doesn't really work. can you help me with that please. i've been looking over the web i can't seem to find something.

Answer 1

You can try:

preg_match("/^.{6,24}$/u", $value);

^ and $ are anchors for start and end of the string.

the u modifier is used to read the string as an unicode string.