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  1. or download this
    use YAPE::Regex::Explain;
print YAPE::Regex::Explain->new(qr/\bCA\b/)->explain;
...
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)                        end of grouping
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  2. or download this
    $ perl -pe " s/\bCA\b/California/ "
Hi ca  Ca CA dooodie
Hi ca  Ca California dooodie