title: Regex Match Pattern in c#
body: <p>Hey I have the following strings as input: </p>
  
  <pre><code>"abcol"  
  "ab_col"  
  "cold"  
  "col_ab"  
  "col.ab"  
  </code></pre>
  
  <p>I have the string col to search from. I'm using regex to match </p>
  
  <pre><code>Match matchResults = Regex.Match(input , "col", RegexOptions.IgnoreCase);
  </code></pre>
  
  <p>I want to match only the string that has this pattern 
  <code>[Any special character or nothing ] + col + [Any special character or nothing]</code></p>
  
  <p>From the above inputs, I want to return only 
  <code>ab_col, col_ab , col.ab</code></p>
  
  <p>Any help is highly appreciated.<br>
  Thanks</p>
  
  <p>[Any special character] = [^A-Za-z0-9]</p>