javascript - Problem with regular verification of mobile phone number

if (!preg_match('/0?(00|01|11|13|14|15|17|18)[0-9]{9}/', $tel)) {

<code>    }
    
    </code>

Why does this regular expression allow mobile phone numbers with more than 11 digits to pass through directly without reporting an error? 00 and 01 11 are customized, just ignore them
The regular expression is not very good. What is wrong? How should I write it?

Reply content:

if (!preg_match('/0?(00|01|11|13|14|15|17|18)[0-9]{9}/', $tel)) {

<code>    }
    
    </code>

Why does this regular expression allow mobile phone numbers with more than 11 digits to pass through directly without reporting an error? 00 and 01 11 are customized, just ignore them

The regular expression is not very good. What is wrong? How should I write it?

Because you are useless ^....$ https://secure.php.net/manual...

<code>preg_match('/^(\+86)?1[34578]\d{9}$/',$phone)</code>