I'm struggling with a Grep Find/Replace action to apply to a file with
sorted lines, each having three units separated by tabs:
first1 second11 third111
first1 second11 third112
first1 second11 third113
first1 second11 third114
first1 second11 third115
first2 second21 third211
first2 second22 third221
first2 second23 third231
first3 second31 third311
first3 second31 third312
first3 second31 third313
first3 second31 third314
first3 second32 third321
first4 second41 third411
first4 second41 third412
first4 second42 third421
first4 second42 third422
first5 second51 third511
first5 second52 third521
first5 second52 third522
first5 second52 third523
first5 second53 third531
...
Now I need to insert an underscore at the beginning of each line IF the
"first" and "second" fields are identical to the respective fields in
its previous line. The result should be this:
first1 second11 third111
_first1 second11 third112
_first1 second11 third113
_first1 second11 third114
_first1 second11 third115
first2 second21 third211
first2 second22 third221
first2 second23 third231
first3 second31 third311
_first3 second31 third312
_first3 second31 third313
_first3 second31 third314
first3 second32 third321
first4 second41 third411
_first4 second41 third412
first4 second42 third421
_first4 second42 third422
first5 second51 third511
first5 second52 third521
_first5 second52 third522
_first5 second52 third523
first5 second53 third531
...
I presume this could be achieved by using positive look-behind
assertion, but all my attempts have failed so far.
Any help greatly is appreciated!
samar
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