Using Regex To Check Name,10 Digit Mobile Number And A 12 Digit Number Using Ng-blur And Match Function In Angularjs

I want to validate these 3 mentioned above but I am finding difficulty in using appropriate functions. ...please help. The html code for 3 inputs

<div>
         <label>User Email</label>
        <div>
           <input  type="text" placeholder="paul@lebensraum.com" ng-model="user.email" name="userMail" required ng-pattern="/^[_a-zA-Z0-9]+(\.[_a-z0-9]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$/">
       </div>
       <div ng-messages="user.userMail.$error" class="error" role="alert" ng-if="user.userMail.$dirty">
        <div ng-message="required" style="margin-left: -13%;">Please User Email ID</div>
        <div ng-message="pattern" style="margin-left: -13%;">Please Enter A Valid Email Id</div>
       </div>
     </div>