Regex to detect Invalid UTF-8 String

Question

In PHP, we can use mb_check_encoding() to determine if a string is valid UTF-8. But that\'s not a portable solution as it requires the mbstring extension to be compiled in a

Answer 1

this works for me for detecting unicode characters, linke emoji or russian or chinese:

private function has_unicode( $string ) 
{     
    $pattern = '/^.*[^\x{00}-\x{00FF}]+.*$/u';
    return preg_match( $pattern, $string ) ? true : false;
}