lib/yaml/ypath.rb: escape '['.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3776 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/yaml/ypath.rb

@@ -10,7 +10,7 @@ module YAML
             @segments = []
             @predicates = []
             @flags = nil
-            while str =~ /^\/?(\/|[^\/[]+)(?:\[([^\]]+)\])?/
+            while str =~ /^\/?(\/|[^\/\[]+)(?:\[([^\]]+)\])?/
                 @segments.push $1
                 @predicates.push $2
                 str = $'