Flash uses Perl Compatible Regular Expression Engine (PCRE) http://www.pcre.org/ http://www.pcre.org/ Ruby uses Oniguruma http://www.geocities.jp/kosako3/onigu

Flash uses Perl Compatible Regular Expression Engine (PCRE) http://www.pcre.org/ http://www.pcre.org/ Ruby uses Oniguruma http://www.geocities.jp/kosako3/oniguruma/ http://www.geocities.jp/kosako3/oniguruma/ While the average regex will probably work on both, you should know there isn't a 1:1 correlation between the two.