[CM] adding regex handling to scheme for max question

[bil at ccrma.Stanford.EDU]

You can see for yourself by running (*s7* 'memory-usage),
perhaps calling (gc) first.  It does add some names
and so forth to the *libc* environment, but I doubt
it is significant.  If you want just the regex functions,
you can extract them from the file that libc.scm writes,
libc_s7.c.