[PHP] Regular Expression for a UK mobile phone number

[Shaun]

Hi,

I am trying to create a regular expression for a mobile phone number. The
number must be 12 digits long(0-9) and begin with 447 and have no spaces. So
far I have come up with this but it keeps telling me the number is invalid
even when its correct!

$regexp = "/447[0-9]{9}/";
  if($_POST[mobile_number] != ''){
    if(preg_match( $regexp, $_POST[mobile_number] )){
      $error = "Invalid Mobile Number";
      header("Location:
edit_rep.php?error=$error&rep_id=".$_GET[rep_id]."&client_id=".$_GET[client_
id]."&rep_name=".$_GET[rep_name]."&client_name=".$_GET[client_name]."");
     exit;
  }
}

I would be most grateful for any advice offered.

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