Issue #3147 has been updated by Shyouhei Urabe.

Status changed from Open to Rejected

"\\\\1", backslash-backslash-one, is a backslash-escaped backslash plus literal 1.
If what you want to get "\\Y" you need another backslash to escape 1 i.e. "\\\\\\1",
backslash-backslash backslash-one.
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http://redmine.ruby-lang.org/issues/show/3147

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