Don't use iterators for FlatMap equality checks

[jviotti]

Signed-off-by: Juan Cruz Viotti jv@jviotti.com

[github-actions]

Benchmark (linux/llvm)

Benchmark suite	Current: 782de09	Previous: 214d23b	Ratio
Regex_Lower_S_Or_Upper_S_Asterisk	2.209336993541995 ns/iter	2.2050867231326547 ns/iter	1.00
Regex_Caret_Lower_S_Or_Upper_S_Asterisk_Dollar	2.194394214416887 ns/iter	2.2100882315668424 ns/iter	0.99
Regex_Period_Asterisk	2.209614306848024 ns/iter	2.1978781538054655 ns/iter	1.01
Regex_Group_Period_Asterisk_Group	2.212415799181412 ns/iter	2.194200727383446 ns/iter	1.01
Regex_Period_Plus	2.4948887103917996 ns/iter	2.5552775977381 ns/iter	0.98
Regex_Period	2.4892612309284026 ns/iter	2.492076400102254 ns/iter	1.00
Regex_Caret_Period_Plus_Dollar	2.4934853635895093 ns/iter	2.2425677651340394 ns/iter	1.11
Regex_Caret_Group_Period_Plus_Group_Dollar	2.494381364797789 ns/iter	2.357148097311435 ns/iter	1.06
Regex_Caret_Period_Asterisk_Dollar	3.4194244349032434 ns/iter	2.486882812300636 ns/iter	1.37
Regex_Caret_Group_Period_Asterisk_Group_Dollar	3.4195349062533147 ns/iter	2.4877530515428172 ns/iter	1.37
Regex_Caret_X_Hyphen	13.058754970206897 ns/iter	13.053329939595303 ns/iter	1.00
Regex_Period_Md_Dollar	73.09651218416596 ns/iter	73.97677875287161 ns/iter	0.99
Regex_Caret_Slash_Period_Asterisk	6.164464547827068 ns/iter	7.160430719688381 ns/iter	0.86
Regex_Caret_Period_Range_Dollar	2.797538056725681 ns/iter	4.039346444819488 ns/iter	0.69
Regex_Nested_Backtrack	458.68291082784447 ns/iter	458.01741358677566 ns/iter	1.00

This comment was automatically generated by workflow using github-action-benchmark.

[github-actions]

Benchmark (macos/llvm)

Benchmark suite	Current: 782de09	Previous: 214d23b	Ratio
Regex_Lower_S_Or_Upper_S_Asterisk	2.2354570003821475 ns/iter	1.6401514303339735 ns/iter	1.36
Regex_Caret_Lower_S_Or_Upper_S_Asterisk_Dollar	2.196484565170083 ns/iter	1.5944826791695377 ns/iter	1.38
Regex_Period_Asterisk	2.1850442526461307 ns/iter	1.5968626160683688 ns/iter	1.37
Regex_Group_Period_Asterisk_Group	2.2462344419384146 ns/iter	1.62399569454731 ns/iter	1.38
Regex_Period_Plus	2.619273579397862 ns/iter	1.9352386635555838 ns/iter	1.35
Regex_Period	2.4732956668862918 ns/iter	1.9471920043530595 ns/iter	1.27
Regex_Caret_Period_Plus_Dollar	2.7431724432892994 ns/iter	1.9271781290128638 ns/iter	1.42
Regex_Caret_Group_Period_Plus_Group_Dollar	2.5439023232585947 ns/iter	1.9170267888698804 ns/iter	1.33
Regex_Caret_Period_Asterisk_Dollar	2.3304566042269754 ns/iter	1.5969896400338144 ns/iter	1.46
Regex_Caret_Group_Period_Asterisk_Group_Dollar	2.2499424612016488 ns/iter	1.600677523665264 ns/iter	1.41
Regex_Caret_X_Hyphen	8.766555878987372 ns/iter	6.749282019105777 ns/iter	1.30
Regex_Period_Md_Dollar	89.17716724092047 ns/iter	70.73669768358648 ns/iter	1.26
Regex_Caret_Slash_Period_Asterisk	6.429787904423716 ns/iter	5.084395979246659 ns/iter	1.26
Regex_Caret_Period_Range_Dollar	3.1170768283864585 ns/iter	2.228777172474936 ns/iter	1.40
Regex_Nested_Backtrack	959.4291774910527 ns/iter	751.2890471935256 ns/iter	1.28

This comment was automatically generated by workflow using github-action-benchmark.

[github-actions]

Benchmark (linux/gcc)

Benchmark suite	Current: 782de09	Previous: 214d23b	Ratio
Regex_Lower_S_Or_Upper_S_Asterisk	2.8032892608314812 ns/iter	3.7418133562061575 ns/iter	0.75
Regex_Caret_Lower_S_Or_Upper_S_Asterisk_Dollar	2.797401731758676 ns/iter	3.7278165694701837 ns/iter	0.75
Regex_Period_Asterisk	2.7991166582535194 ns/iter	3.7297565229277674 ns/iter	0.75
Regex_Group_Period_Asterisk_Group	2.7982653623172724 ns/iter	3.7288010954764115 ns/iter	0.75
Regex_Period_Plus	2.8059233115570392 ns/iter	3.7357140064808174 ns/iter	0.75
Regex_Period	2.496976182248488 ns/iter	3.7282925348027427 ns/iter	0.67
Regex_Caret_Period_Plus_Dollar	2.8084884327397757 ns/iter	3.7309961505397142 ns/iter	0.75
Regex_Caret_Group_Period_Plus_Group_Dollar	2.8026117721655623 ns/iter	3.7296894842484156 ns/iter	0.75
Regex_Caret_Period_Asterisk_Dollar	3.1138574813859035 ns/iter	3.7324915127605673 ns/iter	0.83
Regex_Caret_Group_Period_Asterisk_Group_Dollar	2.7982406902747368 ns/iter	3.7279085104007583 ns/iter	0.75
Regex_Caret_X_Hyphen	12.433583101440634 ns/iter	12.431306255993519 ns/iter	1.00
Regex_Period_Md_Dollar	89.06767075861046 ns/iter	89.63559153647003 ns/iter	0.99
Regex_Caret_Slash_Period_Asterisk	6.529070539486486 ns/iter	6.522908908999184 ns/iter	1.00
Regex_Caret_Period_Range_Dollar	4.351068109268302 ns/iter	4.357682754572321 ns/iter	1.00
Regex_Nested_Backtrack	838.3466188527232 ns/iter	836.166719026071 ns/iter	1.00

This comment was automatically generated by workflow using github-action-benchmark.

[github-actions]

Benchmark (windows/msvc)

Benchmark suite	Current: 782de09	Previous: 214d23b	Ratio
Regex_Lower_S_Or_Upper_S_Asterisk	7.106382812499692 ns/iter	6.9072165178571 ns/iter	1.03
Regex_Caret_Lower_S_Or_Upper_S_Asterisk_Dollar	6.874870535714196 ns/iter	6.883229910714661 ns/iter	1.00
Regex_Period_Asterisk	7.298786830358038 ns/iter	7.090626116072078 ns/iter	1.03
Regex_Group_Period_Asterisk_Group	6.858553571427808 ns/iter	7.217571428571442 ns/iter	0.95
Regex_Period_Plus	7.148637276785306 ns/iter	7.219037946428435 ns/iter	0.99
Regex_Period	7.561809341241507 ns/iter	7.220366485623528 ns/iter	1.05
Regex_Caret_Period_Plus_Dollar	7.22003568205304 ns/iter	7.2370301339283065 ns/iter	1.00
Regex_Caret_Group_Period_Plus_Group_Dollar	7.209024553571958 ns/iter	7.178620950095945 ns/iter	1.00
Regex_Caret_Period_Asterisk_Dollar	7.02996763392884 ns/iter	6.850829433701918 ns/iter	1.03
Regex_Caret_Group_Period_Asterisk_Group_Dollar	7.114104910715164 ns/iter	6.961850000000221 ns/iter	1.02
Regex_Caret_X_Hyphen	11.960128571428998 ns/iter	11.88890714285711 ns/iter	1.01
Regex_Period_Md_Dollar	138.95151611823582 ns/iter	137.56646037651123 ns/iter	1.01
Regex_Caret_Slash_Period_Asterisk	10.730821874998853 ns/iter	10.521857812499036 ns/iter	1.02
Regex_Caret_Period_Range_Dollar	7.646937500000053 ns/iter	7.558535714286155 ns/iter	1.01
Regex_Nested_Backtrack	590.6185999999707 ns/iter	598.9221428571057 ns/iter	0.99

This comment was automatically generated by workflow using github-action-benchmark.