title: Regex: Match words in sentence PHP
body: <p>I have an array with words like</p>
  
  <pre><code>$arr = array("go", "walk", ...)
  </code></pre>
  
  <p>I would like to replace these words with links f they are matched in sentences. But it should be only if they match exactly (for example "walk" should match "Walk" or "walk!" but not also "walking")</p>
  
  <p>And the replacement should be a simple link like: <code>&lt; a href='#walk' &gt;walk&lt; /a &gt;</code></p>
  
  <p>Anybody Any idea?</p>