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bc9251ea49
libc++ (the implementation of the C++ standard library usually used by Clang) throws an exception for the regex used by parse_headers before this patch for certain strings. Work around this by simplifying the regex and parsing the header lines "by hand" partially. I have repro'd this problem with Xcode 11.1 which I believe uses libc++ version 8. This may be a bug in libc++ as I can't see why the regex would result in asymptotic run-time complexity for any strings. However, it may take a while for libc++ to be fixed and for everyone to migrate to it, so it makes sense to work around it in this codebase for now.
