yaml_tree.rb in psych-5.2.0.beta2

- old
+ new
@@ -259,23 +259,23 @@
           tag   = '!binary' # FIXME: change to below when syck is removed
           #tag   = 'tag:yaml.org,2002:binary'
           style = Nodes::Scalar::LITERAL
           plain = false
           quote = false
-        elsif o =~ /\n(?!\Z)/  # match \n except blank line at the end of string
+        elsif o.match?(/\n(?!\Z)/)  # match \n except blank line at the end of string
           style = Nodes::Scalar::LITERAL
         elsif o == '<<'
           style = Nodes::Scalar::SINGLE_QUOTED
           tag   = 'tag:yaml.org,2002:str'
           plain = false
           quote = false
         elsif o == 'y' || o == 'Y' || o == 'n' || o == 'N'
           style = Nodes::Scalar::DOUBLE_QUOTED
         elsif @line_width && o.length > @line_width
           style = Nodes::Scalar::FOLDED
-        elsif o =~ /^[^[:word:]][^"]*$/
+        elsif o.match?(/^[^[:word:]][^"]*$/)
           style = Nodes::Scalar::DOUBLE_QUOTED
-        elsif not String === @ss.tokenize(o) or /\A0[0-7]*[89]/ =~ o
+        elsif not String === @ss.tokenize(o) or /\A0[0-7]*[89]/.match?(o)
           style = Nodes::Scalar::SINGLE_QUOTED
         end
 
         is_primitive = o.class == ::String
         ivars = is_primitive ? [] : o.instance_variables