Which resulted in just one issue? I'm not sure how long they fuzzed or what the methodology was, but this was the panic they found (still not a memory safety issue, more akin to an unchecked exception in Java than a crash in C++):
Since that issue is from the same time as Rust's 1.0 release, I suspect that either it hasn't been run again recently or that things are pretty stable in the regex crate w.r.t. fuzzing.
https://github.com/frewsxcv/afl.rs#trophy-case
Which resulted in just one issue? I'm not sure how long they fuzzed or what the methodology was, but this was the panic they found (still not a memory safety issue, more akin to an unchecked exception in Java than a crash in C++):
https://github.com/rust-lang/regex/issues/84
Since that issue is from the same time as Rust's 1.0 release, I suspect that either it hasn't been run again recently or that things are pretty stable in the regex crate w.r.t. fuzzing.