[Bug 54216] replaceregexp with backlash throws StringIndexOutOfBoundsException

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=54216

--- Comment #2 from Stefan Bodewig <bo...@apache.org> ---
One culprit here is java.util.regex.Matcher#appendReplacement which throws the
exception if it encounters a replacement that ends in an unescaped backslash.

I agree \\ should not be replaced by \ and the patch I'll attach fixes that,
but I'm afraid this is going to break existing builds that contain quadrupeled
backslashes to work around this long standing "feature".

Maybe just documenting what happens is better than fixing the bug, not sure.

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