In your special case a relativly simple solution would be. 
perl -pi.bak -e 's/sequence.V5_0/sequence.V6_3/ if $old =~ /StrCatDone
+. .1./; $old=$_ ' data.dat

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In reply to Re: Altering data files by codeacrobat
in thread Altering data files by Lhamo_rin

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