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--intrepret_irregexp runtime option (flutter/engine#41646)
For extremely large RegExp's that are used in flutter license script, running interpreter-based implementation is faster than running generated unoptimized code. For normal-sized RegExp's optimized code is expected to be faster. Local testing shows 5x speed up on full license script run (311s vs 1430s). Should help with https://github.com/flutter/flutter/issues/118193
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