SCSH SREs support controlling of capturing

or not with the use of , vs ,@.

It's trivial to write a utility to strip away capturing

groups from an SRE, and is useful enough that

we may want to include this as syntax:

  (w/nocapture sre ...)

which would strip all capturing groups from the

enclosed SREs.  There is no corresponding

w/capture, which would defeat the purpose.

Ideally I like the idea of libraries of regexps,

along the lines of Perl's Regexp::Common,

where this would be most useful.  An even

better option is the notion of named but non-

numbered capturing groups, where library

regexps could advertise the named groups

they provide without affecting your counts.

The problem with this is that many people

will want to implement SRFI 115 on top of

existing regexp implementations which don't

support such a feature.  As a workaround you

can just use named captures exclusively and

not rely on positions.

-- 

Alex