title: Using jquery mask plugin for cellphone numbers
body: <p>I'm designing a form which contains some input elements. One of them is about cellphone numbers. In my form, first digit should be between 1-9  , other digits could be any number. 
  Here is my jQuery code.I need a pattern in order to make this project work:</p>
  
  <pre><code>    $(".not-empty2").mask('Z99-9999999', { translation: { 'Z': { pattern: /*an expression comes here*/, optional: true } } }); 
  </code></pre>