Validate 11-digit mobile phone number regular expression

Regular expressions are used as follows:

<script>
var TEL_REGEXP = /^1([38]\d|5[0-35-9]|7[3678])\d{8}$/;

function validateTel (tel){
      if(TEL_REGEXP.test(tel)){
        return true;
      }
      return false;
}
</script>