Remove unused capture
Because Regexp#to_s add (?-mix:), it is not unnecessary.
Regexp#to_s
(?-mix:)
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62250 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Remove unused capture
Because
Regexp#to_sadd(?-mix:), it is not unnecessary.git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62250 b2dd03c8-39d4-4d8f-98ff-823fe69b080e