Extreme regex foo: what you need to know to become a regular expression pro

This tutorial will go beyond the basics of regular expressions. You should already know what the metacharacters are ^[]{}.?| $ and sometimes – and how to use them, you should understand how to use parenthesis for grouping and capturing, and you should be able to construct basic regular expressions to match things like email addresses and URLs. If you’re lost, go read the articles I mentioned in the first paragraph then come back here.

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