This library supports full W3C XML Schema regular expressions inclusive all
Unicode character sets and blocks. The complete grammar can be found under
<http://www.w3.org/TR/xmlschema11-2/#regexs>. It is implemented by the
technique of derivations of regular expressions.
The W3C syntax is extended to support not only union of regular sets, but also
intersection, set difference, exor. Matching of subexpressions is also
The library can be used for constricting lightweight scanners and tokenizers.
It is a standalone library, no external regex libraries are used.
Extensions in 9.2: The library does nor only support String's, but also
ByteString's and Text in strict and lazy variants.