Allow back reference with nest level in Oniguruma for Ruby again (RCR 10)

Submitted by: Wolfgang Nádasi-Donner

This is the revision of Wed May 16 06:44:07 EDT 2007

ABSTRACT

Version 4.2.0 (2006/07/18)of Oniguruma introduced a new element for regular expressions, back reference with nest level ("\k", and "\k"). This feature was removed for Ruby in Oniguruma version 4.2.3 (2006/08/11) with the remark: 2006/08/07: [spec] move definition of USE_BACKREF_AT_LEVEL into NOT_RUBY. This feature should be available for Ruby usage, because it adds a useful function and is already there and tested.

PROBLEM

An already implemented and tested functionality was removed for Ruby usage.

ANALYSIS

Solution is already implemented and tested.

IMPLEMENTATION

Already done

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