Fix appendReplacement validation#204
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Strictly validate replacement strings in Matcher.appendReplacement to match java.util.regex behavior. Throw IllegalArgumentException for trailing $ or \, invalid group references, and invalid named group syntax. Closes google#196
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Strictly validate replacement strings in
Matcher.appendReplacementto matchjava.util.regexbehavior.Throw
IllegalArgumentExceptionfor trailing$or\, invalid group references, and invalid named group syntax.Closes #196