sorry, this doesn't work... 
$str =~ s/((?<!bar)\S*)foo(\S*(?!qux))/${1}123${2}/gx;

print "$str\n";

[download]

prints

bl123 and barthis123thatqux and barso123quxhim and123som 123

[download]
--

when small people start casting long shadows, it is time to go to bed

In reply to Re^2: Match a pattern only if it is not within another pattern by punkish
in thread Match a pattern only if it is not within another pattern by punkish

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