DB<104> $a="3851 A A G G T T"
 
  DB<105> $a=~s/([ACGT]) ([ACGT])/$1$2/g
 
  DB<106> p $a
3851 AA GG TT

[download]

Cheers Rolf

PS:

> The colleague who knows python only suggested a long difficult method of writing out each combination (ie 1+2, 3+4, etc.)...

This pretty much reflects the impression I have when reading in python boards... :)

In reply to Re: Loop to merge every two columns by LanX
in thread Loop to merge every two columns by Renyulb28

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