What if you continue to match them, but not alter them if they are in your stoplist? 

# assuming @stoplist
my %stop;
@stop{ @stoplist } = @stoplist;

s/(\w+)/ 
         ( $stop{$1} || ! defined $self->{$1}{val} ) ? 
           $1 : 
           $self->{$1}{val} 
       /ge;

[download]

Might not be ultra-efficient, though.

In reply to Re: How to not match some words but match all the others by fishbot_v2
in thread How to not match some words but match all the others by set_uk

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