diff --git a/api/v1/contacts/contact_model.php b/api/v1/contacts/contact_model.php
index fb35f365..5d8e3da6 100644
--- a/api/v1/contacts/contact_model.php
+++ b/api/v1/contacts/contact_model.php
@@ -1,10 +1,12 @@
 <?php
+define('number_regex', '/[^0-9]/');
+
 $name = trim(strip_tags(mysqli_real_escape_string($mysqli,$_POST['contact_name'])));
 $title = trim(strip_tags(mysqli_real_escape_string($mysqli,$_POST['contact_title'])));
 $department = intval($_POST['contact_department']);
-$phone = preg_replace("/[^0-9]/", '',$_POST['contact_phone']);
-$extension = preg_replace("/[^0-9]/", '',$_POST['contact_extension']);
-$mobile = preg_replace("/[^0-9]/", '',$_POST['contact_mobile']);
+$phone = preg_replace(number_regex, '', $_POST['contact_phone']);
+$extension = preg_replace(number_regex, '', $_POST['contact_extension']);
+$mobile = preg_replace(number_regex, '', $_POST['contact_mobile']);
 $email = trim(strip_tags(mysqli_real_escape_string($mysqli,$_POST['contact_email'])));
 $notes = trim(strip_tags(mysqli_real_escape_string($mysqli,$_POST['contact_notes'])));
 $auth_method = trim(strip_tags(mysqli_real_escape_string($mysqli,$_POST['contact_auth_method'])));