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pregexp

pregexp is a portable implementation of regular expressions (regexps) that runs in any R5RS- or R4RS-compliant implementation of the programming language Scheme, and in Common Lisp. The regexp notation supported is compatible with Perl’s, and includes such powerful directives as

  • numeric quantifiers

  • non-greedy quantifiers

  • POSIX character classes

  • non-capturing clusters (in addition to the usual capturing kind)

  • selective (i.e., per-cluster) case-insensitivity

  • selective space-insensitivity (with provision for comments)

  • backreferences

  • alternation

  • backtrack pruning

  • lookahead (positive and negative)

  • lookbehind (positive and negative)

This is in addition to the more basic directives familiar to all regexp users.

For Scheme

Simply load the file pregexp.scm into your Scheme. Alternatively, if your dialect allows it, you can install pregexp as a module — consult the file INSTALL.adoc.

However you load pregexp, you will now have access to the procedures

  • pregexp

  • pregexp-match-positions

  • pregexp-match

  • pregexp-split

  • pregexp-replace

  • pregexp-replace*

The use of these procedures is described fully and with examples in the pregexp manual.

For Common Lisp

pregexp.lisp is a Common Lisp implementation of the same routines as in pregexp.scm, with the same behavior (modulo transparent stuff like nil being the CL equivalent of #f).

Documentation

❧❧❧

—Dorai Sitaram