title: How to using regex to check if a string contains German characters in javascript?
body: <p>I am java web developer from China, now I met a problem to detect if the string contains special German characters <strong>ßüöä</strong> in javascript.</p>
  
  <p>I am using <code>jquery.validate.js</code> to make the string only contains characters,numbers and underscore, my regex is <code>/^[a-zA-Z_]+\w*$/i</code>,now I want to change my regex so that it will allow the string contains the special German characters <strong>ßüöä</strong>, could anyone how to change the regex in order to archive my goal?</p>
  
  <p>Thanks in advance!</p>