By default, this module exports a single hash (`%RE') that stores or
generates commonly needed regular expressions. Patterns currently
provided include:

* balanced parentheses and brackets
* delimited text (with escapes)
* integers and floating-point numbers in any base (up to 36)
* comments in 44 languages
* offensive language
* lists of any pattern
* IPv4 addresses
* URIs.
* Zip codes.