These are perf results from 5/25/20, from [regex-performance](github.com/rust-leipzig/regex-performance.git).
```
'../3200.txt' loaded. (Length: 16013977 bytes)
-----------------
Regex: 'Twain'
[ pcre] time: 1.6 ms (+/- 6.8 %), matches: 811
[ pcre-dfa] time: 8.4 ms (+/- 1.3 %), matches: 811
[ pcre-jit] time: 9.9 ms (+/- 0.3 %), matches: 811
[ re2] time: 1.1 ms (+/- 3.6 %), matches: 811
[ onig] time: 11.0 ms (+/- 1.1 %), matches: 811
[ tre] time: 141.0 ms (+/- 0.1 %), matches: 811
[ hscan] time: 0.7 ms (+/- 3.2 %), matches: 811
[rust_regex] time: 1.1 ms (+/- 3.1 %), matches: 811
[rust_regrs] time: 7.1 ms (+/- 1.0 %), matches: 811
-----------------
Regex: '(?i)Twain'
[ pcre] time: 28.4 ms (+/- 0.5 %), matches: 965
[ pcre-dfa] time: 41.0 ms (+/- 1.2 %), matches: 965
[ pcre-jit] time: 10.1 ms (+/- 1.0 %), matches: 965
[ re2] time: 32.0 ms (+/- 0.4 %), matches: 965
[ onig] time: 46.6 ms (+/- 0.4 %), matches: 965
[ tre] time: 184.6 ms (+/- 0.1 %), matches: 965
[ hscan] time: 0.9 ms (+/- 10.5 %), matches: 965
[rust_regex] time: 1.5 ms (+/- 3.3 %), matches: 965
[rust_regrs] time: 11.0 ms (+/- 1.1 %), matches: 965
-----------------
Regex: '[a-z]shing'
[ pcre] time: 183.2 ms (+/- 0.4 %), matches: 1540
[ pcre-dfa] time: 314.4 ms (+/- 0.1 %), matches: 1540
[ pcre-jit] time: 9.3 ms (+/- 1.0 %), matches: 1540
[ re2] time: 52.2 ms (+/- 0.6 %), matches: 1540
[ onig] time: 9.3 ms (+/- 0.6 %), matches: 1540
[ tre] time: 207.8 ms (+/- 0.1 %), matches: 1540
[ hscan] time: 2.5 ms (+/- 3.7 %), matches: 1540
[rust_regex] time: 3.5 ms (+/- 2.8 %), matches: 1540
[rust_regrs] time: 132.4 ms (+/- 0.2 %), matches: 1540
-----------------
[ pcre-dfa] time: 10.9 ms (+/- 1.0 %), matches: 262
[ pcre-jit] time: 1.4 ms (+/- 4.0 %), matches: 262
[ re2] time: 22.9 ms (+/- 1.2 %), matches: 262
[ onig] time: 19.4 ms (+/- 1.2 %), matches: 262
[ tre] time: 204.2 ms (+/- 0.1 %), matches: 262
[ hscan] time: 1.3 ms (+/- 1.1 %), matches: 977
[rust_regex] time: 1.4 ms (+/- 4.3 %), matches: 262
[rust_regrs] time: 1.6 ms (+/- 3.2 %), matches: 262
-----------------
Regex: '\b\w+nn\b'
[ pcre] time: 269.1 ms (+/- 0.3 %), matches: 262
[ pcre-dfa] time: 435.1 ms (+/- 0.1 %), matches: 262
[ pcre-jit] time: 51.4 ms (+/- 0.3 %), matches: 262
[ re2] time: 19.6 ms (+/- 0.7 %), matches: 262
[ onig] time: 327.9 ms (+/- 0.1 %), matches: 262
[ tre] time: 344.2 ms (+/- 1.8 %), matches: 262
[ hscan] time: 66.4 ms (+/- 0.3 %), matches: 262
[rust_regex] time: 100.4 ms (+/- 0.4 %), matches: 262
[rust_regrs] time: 191.5 ms (+/- 0.1 %), matches: 262
-----------------
Regex: '[a-q][^u-z]{13}x'
[ pcre] time: 229.4 ms (+/- 0.2 %), matches: 4094
[ pcre-dfa] time: 838.4 ms (+/- 0.2 %), matches: 4094
[ pcre-jit] time: 1.1 ms (+/- 10.3 %), matches: 4094
[ re2] time: 103.9 ms (+/- 9.5 %), matches: 4094
[ onig] time: 22.8 ms (+/- 0.3 %), matches: 4094
[ tre] time: 518.4 ms (+/- 0.1 %), matches: 4094
[ hscan] time: 36.6 ms (+/- 0.2 %), matches: 4094
[rust_regex] time: 1578.3 ms (+/- 1.8 %), matches: 4094
[rust_regrs] time: 358.9 ms (+/- 0.2 %), matches: 4094
-----------------
[ pcre-dfa] time: 14.3 ms (+/- 0.4 %), matches: 2598
[ pcre-jit] time: 14.9 ms (+/- 0.6 %), matches: 2598
[ re2] time: 23.9 ms (+/- 0.6 %), matches: 2598
[ onig] time: 22.0 ms (+/- 0.6 %), matches: 2598
[ tre] time: 338.2 ms (+/- 0.1 %), matches: 2598
[ hscan] time: 1.6 ms (+/- 1.1 %), matches: 2598
[rust_regex] time: 1.4 ms (+/- 2.9 %), matches: 2598
[rust_regrs] time: 11.7 ms (+/- 0.7 %), matches: 2598
-----------------
[ pcre-dfa] time: 161.6 ms (+/- 0.2 %), matches: 4152
[ pcre-jit] time: 40.7 ms (+/- 0.9 %), matches: 4152
[ re2] time: 48.0 ms (+/- 0.4 %), matches: 4152
[ onig] time: 140.3 ms (+/- 0.1 %), matches: 4152
[ tre] time: 491.6 ms (+/- 0.1 %), matches: 4152
[ hscan] time: 1.7 ms (+/- 7.4 %), matches: 4152
[rust_regex] time: 2.8 ms (+/- 3.1 %), matches: 4152
[rust_regrs] time: 110.9 ms (+/- 0.2 %), matches: 4152
-----------------
[ pcre-dfa] time: 1514.8 ms (+/- 0.2 %), matches: 2598
[ pcre-jit] time: 129.9 ms (+/- 0.3 %), matches: 2598
[ re2] time: 22.2 ms (+/- 0.6 %), matches: 2598
[ onig] time: 40.6 ms (+/- 0.9 %), matches: 2598
[ tre] time: 1087.0 ms (+/- 0.8 %), matches: 2598
[ hscan] time: 1.6 ms (+/- 0.8 %), matches: 2598
[rust_regex] time: 21.4 ms (+/- 0.8 %), matches: 2598
[rust_regrs] time: 961.8 ms (+/- 1.0 %), matches: 2598
-----------------
[ pcre-dfa] time: 1808.7 ms (+/- 0.1 %), matches: 1976
[ pcre-jit] time: 141.8 ms (+/- 0.1 %), matches: 1976
[ re2] time: 22.2 ms (+/- 0.5 %), matches: 1976
[ onig] time: 38.7 ms (+/- 0.4 %), matches: 1976
[ tre] time: 1656.9 ms (+/- 0.3 %), matches: 1976
[ hscan] time: 1.8 ms (+/- 7.2 %), matches: 2598
[rust_regex] time: 21.3 ms (+/- 1.5 %), matches: 1976
[rust_regrs] time: 965.6 ms (+/- 0.3 %), matches: 1976
-----------------
[ pcre-dfa] time: 34.9 ms (+/- 0.4 %), matches: 2
[ pcre-jit] time: 8.3 ms (+/- 1.5 %), matches: 2
[ re2] time: 27.9 ms (+/- 2.3 %), matches: 2
[ onig] time: 37.3 ms (+/- 0.4 %), matches: 2
[ tre] time: 244.5 ms (+/- 0.1 %), matches: 2
[ hscan] time: 1.3 ms (+/- 2.1 %), matches: 4
[rust_regex] time: 1.9 ms (+/- 23.8 %), matches: 2
[rust_regrs] time: 9.9 ms (+/- 0.5 %), matches: 2
-----------------
Regex: '[a-zA-Z]+ing'
[ pcre] time: 398.0 ms (+/- 0.1 %), matches: 78424
[ pcre-dfa] time: 717.5 ms (+/- 0.1 %), matches: 78424
[ pcre-jit] time: 44.4 ms (+/- 0.4 %), matches: 78424
[ re2] time: 59.2 ms (+/- 0.2 %), matches: 78424
[ onig] time: 338.3 ms (+/- 0.0 %), matches: 78424
[ tre] time: 265.1 ms (+/- 0.1 %), matches: 78424
[ hscan] time: 9.6 ms (+/- 1.7 %), matches: 78872
[rust_regex] time: 9.1 ms (+/- 1.1 %), matches: 78424
[rust_regrs] time: 295.3 ms (+/- 0.1 %), matches: 78424
-----------------
Regex: '\s[a-zA-Z]{0,12}ing\s'
[ pcre] time: 180.9 ms (+/- 0.2 %), matches: 55248
[ pcre-dfa] time: 278.2 ms (+/- 0.1 %), matches: 55248
[ pcre-jit] time: 56.4 ms (+/- 0.5 %), matches: 55248
[ re2] time: 33.4 ms (+/- 0.5 %), matches: 55248
[ onig] time: 39.2 ms (+/- 0.4 %), matches: 55248
[ tre] time: 370.6 ms (+/- 0.1 %), matches: 55248
[ hscan] time: 13.2 ms (+/- 1.2 %), matches: 55640
[rust_regex] time: 24.7 ms (+/- 0.7 %), matches: 55248
[rust_regrs] time: 151.3 ms (+/- 0.1 %), matches: 55248
-----------------
[ pcre-dfa] time: 493.5 ms (+/- 0.1 %), matches: 209
[ pcre-jit] time: 20.3 ms (+/- 0.9 %), matches: 209
[ re2] time: 49.7 ms (+/- 0.5 %), matches: 209
[ onig] time: 90.5 ms (+/- 0.2 %), matches: 209
[ tre] time: 407.0 ms (+/- 0.1 %), matches: 209
[ hscan] time: 2.9 ms (+/- 4.2 %), matches: 209
[rust_regex] time: 21.1 ms (+/- 0.6 %), matches: 209
[rust_regrs] time: 229.7 ms (+/- 0.1 %), matches: 209
-----------------
Regex: '["'][^"']{0,30}[?!\.]["']'
[ pcre] time: 25.0 ms (+/- 1.1 %), matches: 8886
[ pcre-dfa] time: 36.9 ms (+/- 0.3 %), matches: 8886
[ pcre-jit] time: 5.5 ms (+/- 1.3 %), matches: 8886
[ re2] time: 24.7 ms (+/- 0.7 %), matches: 8886
[ onig] time: 35.1 ms (+/- 0.2 %), matches: 8886
[ tre] time: 202.6 ms (+/- 0.2 %), matches: 8886
[ hscan] time: 8.1 ms (+/- 1.8 %), matches: 8898
[rust_regex] time: 5.7 ms (+/- 4.9 %), matches: 8886
[rust_regrs] time: 16.9 ms (+/- 0.5 %), matches: 8886
-----------------
[ pcre-dfa] time: 7.1 ms (+/- 1.7 %), matches: 2
[ pcre-jit] time: 0.8 ms (+/- 8.5 %), matches: 2
[ re2] time: 0.5 ms (+/- 9.5 %), matches: 0
[ onig] time: 21.5 ms (+/- 0.1 %), matches: 2
[ tre] time: 168.0 ms (+/- 0.2 %), matches: 2
[ hscan] time: 1.2 ms (+/- 9.9 %), matches: 2
[rust_regex] time: 1.3 ms (+/- 2.4 %), matches: 2
[rust_regrs] time: 0.5 ms (+/- 11.8 %), matches: 2
-----------------
Total Results:
[ pcre] time: 5179.7 ms, score: 3 points,
[ pcre-dfa] time: 6715.7 ms, score: 0 points,
[ pcre-jit] time: 546.2 ms, score: 33 points,
[ re2] time: 543.5 ms, score: 23 points,
[ onig] time: 1240.5 ms, score: 7 points,
[ tre] time: 6831.5 ms, score: 0 points,
[ hscan] time: 151.3 ms, score: 67 points,
[rust_regex] time: 1796.8 ms, score: 52 points,
[rust_regrs] time: 3456.0 ms, score: 7 points,
```