A regular expression (or regexp) is a pattern that describes a whole class of strings. A full description of regular expressions and their syntax is beyond the scope of this manual; an introduction can be found in the Emacs manual (see section `Syntax of Regular Expressions' in The GNU Emacs Manual, or in many general Unix reference books.
If your system does not include a POSIX regular expression library, and
you have not linked Guile with a third-party regexp library such as Rx,
these functions will not be available. You can tell whether your Guile
installation includes regular expression support by checking whether the
*features* list includes the regex symbol.
[FIXME: it may be useful to include an Examples section. Parts of this interface are bewildering on first glance.]
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