irregex
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Portable Efficient IrRegular Expressions
http://synthcode.com/scheme/irregex/
A fully portable and efficient R[4567]RS implementation of regular
expressions, supporting both POSIX syntax with various (irregular)
PCRE extensions, as well as SCSH's SRE syntax. DFA matching is used
when possible, otherwise a closure-compiled NFA approach is used.
Documentation is in the file irregex.html.