refactor regexp (bug #34440) * liboctave/regexp.h, liboctave/regexp.cc: New files. Provide classes and functions for regular expressions. Adapted from src/DLD-FUNCTIONS/regexp.cc. * regex-match.h, regex-match.cc: Delete * liboctave/Makefile.am (INCS, LIBOCTAVE_CXX_SOURCES): Update. * variables.cc (name_matches_any_pattern): Use new regexp class. * symtab.h (symbol_table::regexp_global_variables, symbol_table::do_clear_variable_regexp, symbol_table::do_regexp): Likewise. * DLD-FUNCTIONS/regexp.cc (parse_options): New function. (octregexp, octcellregexp, octregexprep): Extract matching code for use in new regexp class. Use new regexp class to provide required functionality.

((nil .
      ((c-file-style . "gnu")
       (indent-tabs-mode . nil)
       (fill-column . 72)
       (eval . (when (string-match "\\.h\\'" (buffer-file-name))
                 (unless (string-match "/gnulib/" (buffer-file-name))
                   (c++-mode)
                   (c-set-style "gnu"))))))
 (change-log-mode . ((indent-tabs-mode . t)))
 (makefile-mode . ((indent-tabs-mode . t))))