title: How can i only keep number alphabetical letter in my String
body: <p>I want to remove all the strange symbol out of my string.
  only keep some [A-Z][a-z][0-9][" ' : ; / ? . , &lt; > ` ~ ! @ # $ % ^ &amp; * ( ) ]
  in my string.
  Example </p>
  
  <pre><code>String a="abc:d(E) ƒ†â¥‡";
  </code></pre>
  
  <p>Result will be:</p>
  
  <pre><code>a="abc:d(E)";
  </code></pre>
  
  <p>I only just study about java regex a little. 
  Would you help me with this.</p>
  
  <p>My code until now</p>
  
  <pre><code>a=a.replaceAll("[^a-zA-Z]+, "")
  </code></pre>
  
  <p>don't know to add the [* &amp; ^ ..] part </p>