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I have mostly been staying away from learning regular expressions. And I know I should not be. JavaScript provided me a way to learn both the language and regular expressions a bit. It supports the Perl 5 version of regular expressions. The little bit I have been playing with are very powerful.
After JavaScript I plan to go back and beef up my Java skills. But I might be able to dig in deeper and gain some good experience with regular expressions as well. Today I only scratched the surface of what looks to be a powerful tool.