* parse.y (yyerror): limit error message length.  [ruby-dev:31848]
	* regex.c (re_mbc_startpos): separated from re_adjust_startpos.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@16788 b2dd03c8-39d4-4d8f-98ff-823fe69b080e