Given your example, if you are trying to do substitutions on all the lines which match all the 2-numbered lines, just ignore the "not parts" ... 

$line =~ s/(pattern1).+?pattern2.+?\1/substitute/;

[download]

... Above will work since "pattern2" does not appear (per your example) in any lines identified by the 1s, so they remain unchanged.

In reply to Re: How can I build regexp with "not" assertion? by parv
in thread How can I build regexp with "not" assertion? by putnik

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