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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Based on your requirements, seems like PCRE2 should fit the bill.
I suggest tre. I found it effortless to embed.
regexp9 from plan9, written by Rob Pike. Two files (regexp9.h and regexp9.c) for the entire library. It is fast and feature rich.
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