title: Problem with regular expression!
body: <p>I have used the following pattern for the regular expression for the phone number </p>
  
  <pre><code>pattern="[0-9 -+]+$";
  </code></pre>
  
  <p>The phone number may contain numbers, hyphen(-), space and plus(+). It works when i use numbers only. When numbers and alphabets are used it does not work. </p>
  
  <p>What can be the problem, please do let me know. </p>
  
  <p>Thanks in advance</p>