Text.RE

We have a regex tutorial at http://tutorial.regex.uk.

This module just provides a brief overview of the regex package. You will need to import one of the API modules of which there is a choice which will depend upon two factors:

• Which flavour of regular expression do you want to use? If you need Posix flavour REs then you will want the TDFA modules, otherwise its PCRE for Perl-style REs.

• What type of text do you want to match: (slow) Strings, ByteString, ByteString.Lazy, Text, Text.Lazy or the anachronistic Seq Char or indeed some good old-fashioned polymorphic operators?

While we aim to provide all combinations of these choices, some of them are currently not available. In the regex package we have:

• Text.RE.TDFA.ByteString

• Text.RE.TDFA.ByteString.Lazy

• Text.RE.ZeInternals.TDFA

• Text.RE.TDFA.Sequence

• Text.RE.TDFA.String

• Text.RE.TDFA.Text

• Text.RE.TDFA.Text.Lazy

• Text.RE.TDFA

The PCRE modules are contained in the separate regex-with-pcre package:

• Text.RE.PCRE.ByteString

• Text.RE.PCRE.ByteString.Lazy

• Text.RE.ZeInternals.PCRE

• Text.RE.PCRE.Sequence

• Text.RE.PCRE.String

• Text.RE.PCRE

For more specialist applications we have the following:

• Text.RE.REOptions for specifying back-end specific options;

• Text.RE.Replace for the full text-replacement toolkit;

• Text.RE.TestBench for building up, testing and documenting; macro environments for use in REs;

• Text.RE.Tools for an AWK-like text-processing toolkit.