[m-dev.] Regular expression library

[Ralph Becket]

I've been thinking about contributing a regular expression
library I knocked up that uses lex.  It's pretty efficient 
and handles about 90% of the standard stuff you find in egrep
expressions - it doesn't handle weirder things like \b, \< and
\>, however.

The alternative would be to knock up a binding to the 
POSIX regexp library.

Any preferences either way?

- Ralph
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