lib/active_support/inflector/methods.rb in activesupport-4.2.0.beta1 vs lib/active_support/inflector/methods.rb in activesupport-4.2.0.beta2

@@ -89,10 +89,10 @@
     #
     #   'SSLError'.underscore.camelize # => "SslError"
     def underscore(camel_cased_word)
       return camel_cased_word unless camel_cased_word =~ /[A-Z-]|::/
       word = camel_cased_word.to_s.gsub('::', '/')
-      word.gsub!(/(?:([A-Za-z\d])|^)(#{inflections.acronym_regex})(?=\b|[^a-z])/) { "#{$1}#{$1 && '_'}#{$2.downcase}" }
+      word.gsub!(/(?:([A-Za-z\d])|\b)(#{inflections.acronym_regex})(?=\b|[^a-z])/) { "#{$1}#{$1 && '_'}#{$2.downcase}" }
       word.gsub!(/([A-Z\d]+)([A-Z][a-z])/,'\1_\2')
       word.gsub!(/([a-z\d])([A-Z])/,'\1_\2')
       word.tr!("-", "_")
       word.downcase!
       word