title: Applying tags through Regex to spcefic characters of a string given an array with includes the numbers
body: <p>I'm progamming in javascript/jQuery.
  Say, I have an array with includes a few number [1, 4, 5] and a string "theword".
  I want to turn that string into <code>"t&lt;b&gt;h&lt;/b&gt;ew&lt;b&gt;or&lt;/b&gt;d"</code>.
  What is the best way to do this with RegEx?</p>