i am enable the macro 'DISABLE_REGEXP' , and build errored , many error in re.c~
what do you mean you enabled DISABLE_REGEXP? I guess you mean the oposite and you enabled RegExp? Regexp isn't yet integrated into mruby. The existing code was copied from MRI but isn't yet fully adopted to mruby. So for the time being you can't enable RegExp in mruby.
(Is this issue closable?)