title: Replace first occurance of a colon with tab
body: <p>A line may have 100 colons, but I only want the first colon on each line replaced with a tab.</p>
  
  <p>Example of input data (will differentiate a lot).</p>
  
  <pre><code>5b33b9d0a57ff17839bdce76acdd6bcd:::diq23hnjr432ufjn0o0:243r:3rwg:bob@bob.de
  5b33b9d0a57ff17839bdce76acdd6bcd:3432rfwediq23hnjr432ufjn0o0:243r:3rwg:bob@bob.de
  </code></pre>
  
  <p>Output I require:</p>
  
  <pre><code>5b33b9d0a57ff17839bdce76acdd6bcd    ::diq23hnjr432ufjn0o0:243r:3rwg:bob@bob.de
  5b33b9d0a57ff17839bdce76acdd6bcd    3432rfwediq23hnjr432ufjn0o0:243r:3rwg:bob@bob.de
  </code></pre>
  
  <p>I'm simply just looking for a Regex for this, sorry don't have much more to add, can answer any questions, thankyou</p>