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Commit 72ce0c80 authored by Mark de Wever's avatar Mark de Wever Committed by Louis Dionne
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[libc++][regex] Validate backreferences in the constructor. 

This patch enables throwing exceptions for invalid backreferences
in the constructor when using the basic, extended,  grep, or egrep grammar.

This fixes bug 34297.

Differential Revision: https://reviews.llvm.org/D62453
parent e5782377
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