CODE EXAMPLE FOR PHP

php preg_match special characters

  $string="sadw$"
  if(preg_match("/[[^'£$%^&*()}{@:'#~?><>,;@|-=-_+-¬`]]/", $string)){
   //this string contain atleast one of these [^'£$%^&*()}{@:'#~?><>,;@|-=-_+-¬`] characters
  }