title: How to clean a string using python regular expression
body: <p>I have the following string which have to clean</p>
  
  <pre><code>#import re
  
  addr="abcd&amp;^fhj"
  problemchars = re.compile(r'[=\+/&amp;&lt;&gt;;\'"\?%#$@\,\. \t\r\n]')
  re.search(problemchars,addr)
  </code></pre>