POSIX regular expressions on Irix 5.3

[Ross Ihaka]

If you look in the R source tree in R/src/regex you will find a version
of Henry Spencer's regular expression library.  You could try compiling
and installing that (you will need to modify the Makefile).  Some SGI
compilers have trouble with it, but it may work for you.

If that doesn't work, there are a number of GNU regular expression
libraries, which you can get from the usual GNU places.  Install one
of them and then try again.  You may also want to pick up a recent version
of the readline library at the same time.

I'd be interested in a report if you are successful.

	Ross
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