[Ironruby-core] Code Review: StringGsubWithPattern

[Dave Remy]

tfpt review "/shelveset:StringGsubWithPattern;REDMOND\dremy"
Comment  :
  Changes for string.gsub with pattern ruby specs to pass.  The following tests now pass:

  String#gsub with pattern, replacement replaces \& and \0 with the complete match
  String#gsub with pattern, replacement replaces \` with everything before the current match
  String#gsub with pattern, replacement replaces \' with everything after the current match
  String#gsub with pattern, replacement replaces \+ with the last paren that actually matched
  String#gsub with pattern, replacement treats \+ as an empty string if there was no captures
  String#gsub with pattern, replacement maps \\ in replacement to \
  String#gsub with pattern, replacement leaves \ at the end of replacement untouched


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