title: replace all instances of one character after a specific character in a string
body: <p>I hate to ask another "how do you do this with regex" question on here...there seem to be a lot of them. But, I am struggling with this. </p>
  
  <p>I am working in C#, and I need to correct a datetime string before I convert it from a string to a DateTime datatype variable. My string looks like this:</p>
  
  <p>2012-01-24T17-52-08Z</p>
  
  <p>I need to replace the "-" characters that occur after the "T" with colons, so it will look like this:</p>
  
  <p>2012-01-24T17:52:08Z</p>
  
  <p>I have tried to adapt the code from <a href="https://stackoverflow.com/questions/1468972/regex-replace-a-specific-character-after-the-appearence-of-another-character-in">this example</a> but, to no avail. I have been using <a href="http://gskinner.com/RegExr/" rel="nofollow noreferrer">this wonderful tool</a> to try to get this working.</p>
  
  <p>I know this will be simple to someone who regularly works with RegEx but, I work with it so rarely that I forget most of what I learned before I get a chance to use it again.</p>
  
  <p>Thanks for any help you can give.</p>