Ruby

use \A and \z instead of ^ and $ in regexp

• test/ruby/enc/test_case_comprehensive.rb
  (TestComprehensiveCaseFold::read_data): use \A and \z instead of
  ^ and $ in regexp.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55415 b2dd03c8-39d4-4d8f-98ff-823fe69b080e