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Google's `RE2 <https://github.com/google/re2>`_ regex engine. The regex string must adhere to the documented `syntax <https://github.com/google/re2/wiki/Syntax>`_. The engine is designed to complete execution in linear time as well as limit the amount of memory used. Envoy emits two stats for tracking the program size of regexes: the histogram ``re2.program_size``, which records the program size, and the counter ``re2.exceeded_warn_level``, which is incremented each time the program size exceeds the warn level threshold.
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