string - Convert spaces to tabs in RegEx -

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How do you say the following in regex: 

  foreach line look at the beginning string Convert 3 groups of each group to one tab Once a character is found in addition to a location, then stop it

This is what I've done so far: 

  / ^ + / \ t / g

However, it converts everywhere to 1 tab

Any help will be appreciated .

with Pearl: 

  perl -pe '1 while s / \ G {3} / \ For example, with the following input,  
  between the three loops, between three loops, three six places, three in the middle six, space  
 
 Output (tab replaced by  \ t ) is 
 
  $ perl -pe '1 while s / \ g {3} / \ t / gc' input |

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