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.

--- a/src/variables.cc
+++ b/src/variables.cc
@@ -36,7 +36,7 @@
 #include "oct-env.h"
 #include "file-ops.h"
 #include "glob-match.h"
-#include "regex-match.h"
+#include "regexp.h"
 #include "str-vec.h"
 
 #include <defaults.h>
@@ -2050,9 +2050,7 @@
         {
           if (have_regexp)
             {
-              regex_match pattern (patstr);
-
-              if (pattern.match (nm))
+              if (is_regexp_match (patstr, nm))
                 {
                   retval = true;
                   break;