Add 'emptymatch', 'noemptymatch' options to regular expressions. * NEWS: Announce new options. * liboctave/regexp.cc (regexp::match): Add processing option for zero length matches. * liboctave/regexp.h (class opts): Add emptymatch option to constructors, setter/getter routines, private variable. * DLD-FUNCTIONS/regexp.cc (parse_options): Add emptymatch to options parsing routine. * DLD-FUNCTIONS/regexp.cc (octregexp): Ignore emptymatch when determing output ordering of arguments. * DLD-FUNCTIONS/regexp.cc (Fregexp): Add new options to docstring. Add %!tests for new behavior. * DLD-FUNCTIONS/regexp.cc (Fregexprep): Add %!tests for new behavior.

gnulib = [git]git://git.sv.gnu.org/gnulib