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.
