Finding unique CSS colors with grep and perl

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Just a tiny one-liner I’ve found useful to get unique CSS color values in a style sheet: 
egrep -r '#[a-fA-F0-9]{3,6}+(\s|;)' *.css|perl -ne 'if (m/(#[a-fA-F0-9]{3,6}+)(\s|;)/){print "$1\n";}'|sort|uniq
Suggestions and improvements are welcome!