The output I would like to see is: temp = 0

As whatever matches will be replaced, just include those 6 characters in the search pattern: 

$temp =~ s/$pattern\w{6}//i;

[download]

As for the inversion, see reverse.

In reply to Re^3: Regex - remove characters (pattern not terminated) by almut
in thread Regex - remove characters (pattern not terminated) by twaddlac

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