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Port NIM regex tests to improve test coverage (#120846)
Fixes #61895 This PR ports regex functional tests from the [nim-regex](https://github.com/nitely/nim-regex) project to increase .NET's regex test coverage, following the same pattern used for PCRE and Rust test suites. ## Changes - Added `RegexNimTests.cs` with 156 unique test cases focusing on patterns not already covered by existing tests - Updated `System.Text.RegularExpressions.Tests.csproj` to include the new test file - All tests pass across all regex engines (Interpreter, Compiled, NonBacktracking, SourceGenerated) ## Test Coverage The ported tests provide additional coverage for unique patterns including: - **Escaped quantifiers**: `\*+`, `\??`, `\++?` - testing literal `*`, `+`, `?` characters with quantifiers - **Nested repetitions**: `(a*)*`, `(a*)*b`, `((a)*(a)*)*` - edge case patterns - **Complex patterns**: `a(b|c)*d`, `((a(b)*)*(b)*)`, alternations with grouping - **Unicode character classes**: `\d` matching `۲`, `\D` matching `⅕` - **Lookahead/lookbehind**: Positive/negative assertions (filtered for NonBacktracking engine) - **Named groups**: `(?<name>...)` syntax - **Word boundary edge cases**: `\b\b\b` patterns - **Empty patterns and special cases** ## Deduplication After analysis, 25 duplicate and trivial test cases were removed that were already covered by existing tests in `Regex.Match.Tests.cs`, `Regex.Groups.Tests.cs`, and other test files. The remaining tests focus on unique patterns and edge cases. ## Compatibility Notes Some NIM-specific patterns were excluded or adapted for .NET compatibility: - **Removed** `\y` escape sequence (not recognized in .NET) - **Removed** `(?U)` ungreedy flag (not supported in .NET) - **Removed** Unicode case folding tests (ß ↔ ss) due to different behavior - **Converted** named group syntax from `(?P<name>)` to .NET's `(?<name>)` format - **Filtered** lookahead/lookbehind tests for NonBacktracking engine (throws NotSupportedException) ## Test Results - Total tests: 29,899 (added ~600+ test executions across all engines) - Failures: 0 - All tests pass successfully The MIT license for nim-regex was already present in `THIRD-PARTY-NOTICES.TXT`. <!-- START COPILOT CODING AGENT SUFFIX --> <details> <summary>Original prompt</summary> > > ---- > > *This section details on the original issue you should resolve* > > <issue_title>Port nim regex tests</issue_title> > <issue_description>Nim has lots of regex functional tests we should port over to improve our coverage: > https://github.com/nitely/nim-regex/blob/eeefb4f51264ff3bc3b36caf55672a74f52f5ef5/tests/tests.nim</issue_description> > > <agent_instructions>You can see in https://github.com/dotnet/runtime/tree/main/src/libraries/System.Text.RegularExpressions/tests/FunctionalTests we have a file of tests ported from PCRE and a file of tests ported from Rust. Please similarly port the cited NIM tests (or a newer version if there is one); any that don't pass but should need to be marked as [ActiveIssue(...)]... any that don't pass but that's expected should be removed.</agent_instructions> > > ## Comments on the Issue (you are @copilot in this section) > > <comments> > <comment_new><author>@</author><body> > Tagging subscribers to this area: @eerhardt, @dotnet/area-system-text-regularexpressions > See info in [area-owners.md](https://github.com/dotnet/runtime/blob/main/docs/area-owners.md) if you want to be subscribed. > <details> > <summary>Issue Details</summary> > <hr /> > > Nim has lots of regex functional tests we should port over to improve our coverage: > https://github.com/nitely/nim-regex/blob/eeefb4f51264ff3bc3b36caf55672a74f52f5ef5/tests/tests.nim > > <table> > <tr> > <th align="left">Author:</th> > <td>stephentoub</td> > </tr> > <tr> > <th align="left">Assignees:</th> > <td>-</td> > </tr> > <tr> > <th align="left">Labels:</th> > <td> > > `area-System.Text.RegularExpressions` > > </td> > </tr> > <tr> > <th align="left">Milestone:</th> > <td>.NET 7.0</td> > </tr> > </table> > </details></body></comment_new> > <comment_new><author>@joperezr</author><body> > This will likely miss ZBB but will still make it before 7.0. Adjusting the milestone just because this is not technically a blocker for 7.0.</body></comment_new> > </comments> > </details> Fixes #61895 <!-- START COPILOT CODING AGENT TIPS --> --- ✨ Let Copilot coding agent [set things up for you](https://github.com/dotnet/runtime/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot) — coding agent works faster and does higher quality work when set up for your repo. --------- Co-authored-by: copilot-swe-agent[bot] <[email protected]> Co-authored-by: stephentoub <[email protected]>
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‎src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/RegexNimTests.cs‎

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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using Xunit;
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namespace System.Text.RegularExpressions.Tests
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{
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/// <summary>
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/// These tests were ported from https://github.com/nitely/nim-regex/blob/master/tests/tests.nim
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/// in order to increase .NET's test coverage. You can find the relevant repo license in this folder's THIRD-PARTY-NOTICES.TXT file.
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/// </summary>
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public class RegexNimTests
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{
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public static IEnumerable<object[]> NimTestData()
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{
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foreach (RegexEngine engine in RegexHelpers.AvailableEngines)
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{
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(string pattern, RegexOptions options, string input, bool expectedSuccess)[] cases = NimTestData_Cases(engine).ToArray();
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Regex[] regexes = RegexHelpers.GetRegexes(engine, cases.Select(c => (c.pattern, (CultureInfo?)null, (RegexOptions?)c.options, (TimeSpan?)null)).ToArray());
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for (int i = 0; i < regexes.Length; i++)
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{
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yield return new object[] { regexes[i], cases[i].input, cases[i].expectedSuccess };
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}
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}
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}
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public static IEnumerable<(string Pattern, RegexOptions options, string Input, bool ExpectedSuccess)> NimTestData_Cases(RegexEngine engine)
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{
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yield return ("", RegexOptions.None, "", true);
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yield return ("((a)*b)", RegexOptions.None, "aab", true);
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yield return ("a(b|c)*d", RegexOptions.None, "abbbbccccd", true);
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yield return ("((a)*(b)*)", RegexOptions.None, "abbb", true);
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yield return ("((a(b)*)*(b)*)", RegexOptions.None, "abbb", true);
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yield return ("a(b|c)*d", RegexOptions.None, "ab", false);
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yield return ("\\s\".*\"\\s", RegexOptions.None, " \"word\" ", true);
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yield return ("\\**", RegexOptions.None, "**", true);
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yield return ("\\++", RegexOptions.None, "++", true);
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yield return ("\\?+", RegexOptions.None, "??", true);
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yield return ("\\?*", RegexOptions.None, "??", true);
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yield return ("\\??", RegexOptions.None, "?", true);
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yield return ("\\???", RegexOptions.None, "?", true);
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yield return ("\\**?", RegexOptions.None, "**", true);
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yield return ("\\++?", RegexOptions.None, "++", true);
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yield return ("\\?+?", RegexOptions.None, "??", true);
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yield return ("\\?*?", RegexOptions.None, "??", true);
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yield return ("(a*)*", RegexOptions.None, "aaa", true);
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yield return ("((a*|b*))*", RegexOptions.None, "aaabbbaaa", true);
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yield return ("(a?)*", RegexOptions.None, "aaa", true);
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yield return ("((a)*(a)*)*", RegexOptions.None, "aaaa", true);
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yield return ("(a|b)*", RegexOptions.None, "abab", true);
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yield return ("(a|b)+", RegexOptions.None, "abab", true);
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yield return ("(a|b|c)*", RegexOptions.None, "abcabc", true);
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yield return ("(a|b|c)+", RegexOptions.None, "abcabc", true);
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yield return ("(a|b)*c", RegexOptions.None, "ababc", true);
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yield return ("a(a|b)*c", RegexOptions.None, "aababc", true);
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yield return ("a(a|b)+c", RegexOptions.None, "aababc", true);
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yield return ("a|b*", RegexOptions.None, "a", true);
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yield return ("a|b*", RegexOptions.None, "b", true);
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yield return ("a|b*", RegexOptions.None, "bb", true);
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yield return ("a*a*", RegexOptions.None, "aaa", true);
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yield return ("a*b*", RegexOptions.None, "aabb", true);
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yield return ("(a*)*b", RegexOptions.None, "aaab", true);
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yield return ("a*b*c*", RegexOptions.None, "aabbcc", true);
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yield return ("a*b*", RegexOptions.None, "ab", true);
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yield return ("a*b*", RegexOptions.None, "a", true);
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yield return ("a*b*", RegexOptions.None, "b", true);
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yield return ("a*b*", RegexOptions.None, "", true);
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yield return ("a+", RegexOptions.None, "a", true);
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yield return ("ab+", RegexOptions.None, "abb", true);
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yield return ("aba+", RegexOptions.None, "abaa", true);
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yield return ("a+a+", RegexOptions.None, "aa", true);
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yield return ("a+a+", RegexOptions.None, "aaa", true);
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yield return ("a+b+", RegexOptions.None, "ab", true);
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yield return ("a+b+", RegexOptions.None, "aabb", true);
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yield return ("(a+|b)+", RegexOptions.None, "aabb", true);
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yield return ("(a+|b+)*", RegexOptions.None, "aabb", true);
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yield return ("ab?", RegexOptions.None, "a", true);
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yield return ("ab?", RegexOptions.None, "ab", true);
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yield return ("ab?a", RegexOptions.None, "aba", true);
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yield return ("ab?a", RegexOptions.None, "aa", true);
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yield return ("a?b?", RegexOptions.None, "ab", true);
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yield return ("a?b?", RegexOptions.None, "a", true);
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yield return ("a?b?", RegexOptions.None, "b", true);
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yield return ("a?b?", RegexOptions.None, "", true);
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yield return ("a??b??", RegexOptions.None, "ab", true);
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yield return ("a??b??", RegexOptions.None, "a", true);
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yield return ("a??b??", RegexOptions.None, "b", true);
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yield return ("a??b??", RegexOptions.None, "", true);
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yield return ("\\(a\\)", RegexOptions.None, "(a)", true);
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yield return ("a\\*b", RegexOptions.None, "a*b", true);
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yield return ("a\\*b*", RegexOptions.None, "a*bbb", true);
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yield return ("\\\\", RegexOptions.None, "\\", true);
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yield return ("\\\\\\\\", RegexOptions.None, "\\\\", true);
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yield return ("\\w", RegexOptions.None, "a", true);
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yield return ("\\w*", RegexOptions.None, "abc123", true);
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yield return ("\\w+", RegexOptions.None, "abc123", true);
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yield return ("\\w+", RegexOptions.None, "abc_123", true);
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yield return ("\\d", RegexOptions.None, "1", true);
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yield return ("\\d*", RegexOptions.None, "123", true);
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yield return ("\\d+", RegexOptions.None, "123", true);
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yield return ("\\d+", RegexOptions.None, "123abc", true);
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yield return ("\\d", RegexOptions.None, "۲", true);
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yield return ("\\s", RegexOptions.None, " ", true);
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yield return ("\\s*", RegexOptions.None, " ", true);
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yield return ("\\s*", RegexOptions.None, " \t\r", true);
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yield return ("\\s+", RegexOptions.None, " ", true);
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yield return ("\\s+", RegexOptions.None, " \t\n", true);
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yield return ("\\s", RegexOptions.None, "\u0020", true);
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yield return ("\\s", RegexOptions.None, "\u2028", true);
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yield return ("\\W", RegexOptions.None, "!", true);
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yield return ("\\W+", RegexOptions.None, "!@#", true);
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yield return ("\\D", RegexOptions.None, "a", true);
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yield return ("\\D", RegexOptions.None, "⅕", true);
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yield return ("\\D+", RegexOptions.None, "abc", true);
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yield return ("\\D+", RegexOptions.None, "!@#", true);
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yield return ("\\S", RegexOptions.None, "a", true);
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yield return ("\\S+", RegexOptions.None, "abc", true);
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yield return ("[abc]", RegexOptions.None, "a", true);
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yield return ("[abc]", RegexOptions.None, "b", true);
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yield return ("[abc]", RegexOptions.None, "c", true);
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yield return ("[abc]", RegexOptions.None, "d", false);
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yield return ("[a-z]", RegexOptions.None, "a", true);
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yield return ("[a-z]", RegexOptions.None, "z", true);
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yield return ("[a-z]", RegexOptions.None, "A", false);
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yield return ("[a-z]+", RegexOptions.None, "abc", true);
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yield return ("[0-9]+", RegexOptions.None, "123", true);
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yield return ("[^abc]", RegexOptions.None, "d", true);
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yield return ("[^abc]", RegexOptions.None, "a", false);
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yield return ("[^a-z]", RegexOptions.None, "1", true);
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yield return ("a{3}", RegexOptions.None, "aaa", true);
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yield return ("a{3}", RegexOptions.None, "aa", false);
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yield return ("a{3}", RegexOptions.None, "aaaa", true);
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yield return ("a{2,4}", RegexOptions.None, "aa", true);
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yield return ("a{2,4}", RegexOptions.None, "aaa", true);
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yield return ("a{2,4}", RegexOptions.None, "aaaa", true);
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yield return ("a{2,4}", RegexOptions.None, "a", false);
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yield return ("a{2,4}", RegexOptions.None, "aaaaa", true);
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yield return ("a{2,}", RegexOptions.None, "aa", true);
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yield return ("a{2,}", RegexOptions.None, "aaa", true);
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yield return ("a{2,}", RegexOptions.None, "aaaa", true);
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yield return ("a{2,}", RegexOptions.None, "a", false);
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yield return ("(?:ab)+", RegexOptions.None, "ab", true);
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yield return ("(?:ab)+", RegexOptions.None, "abab", true);
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yield return ("(?:ab)+", RegexOptions.None, "ababab", true);
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yield return ("(?:ab)+", RegexOptions.None, "a", false);
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yield return ("a*?", RegexOptions.None, "aaa", true);
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yield return ("a??", RegexOptions.None, "aaa", true);
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yield return ("a{2,4}?", RegexOptions.None, "aaa", true);
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yield return ("(a*)*?b", RegexOptions.None, "aaab", true);
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yield return ("(a*?)*b", RegexOptions.None, "aaab", true);
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yield return ("abc$", RegexOptions.None, "abcz", false);
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yield return ("^abc$", RegexOptions.None, "abcz", false);
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yield return ("^abc$", RegexOptions.None, "zabc", false);
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yield return ("\\b", RegexOptions.None, "a", true);
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yield return ("\\b", RegexOptions.None, " a", true);
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yield return ("\\b", RegexOptions.None, "a ", true);
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yield return ("\\B", RegexOptions.None, "ab", true);
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yield return (".+", RegexOptions.None, "abc", true);
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yield return ("(?<foo>a)", RegexOptions.None, "a", true);
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yield return ("(?<foo>a)(?<bar>b)", RegexOptions.None, "ab", true);
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// Lookahead and lookbehind are not supported by NonBacktracking engine
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if (engine != RegexEngine.NonBacktracking)
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{
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yield return ("a(?=b)\\w", RegexOptions.None, "ab", true);
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yield return ("a(?=c)\\w", RegexOptions.None, "ab", false);
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yield return ("\\w(?<=a)b", RegexOptions.None, "ab", true);
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yield return ("\\w(?<=c)b", RegexOptions.None, "ab", false);
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yield return ("a(?!c)\\w", RegexOptions.None, "ab", true);
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yield return ("a(?!b)\\w", RegexOptions.None, "ab", false);
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yield return ("\\w(?<!c)b", RegexOptions.None, "ab", true);
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yield return ("\\w(?<!a)b", RegexOptions.None, "ab", false);
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}
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yield return ("[\\b]", RegexOptions.None, "\b", true);
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yield return ("\\b\\b\\baa\\b\\b\\b", RegexOptions.None, "aa", true);
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yield return ("(?i)abc", RegexOptions.IgnoreCase, "ABC", true);
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yield return ("(?i)abc", RegexOptions.IgnoreCase, "abc", true);
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yield return ("(?i)abc", RegexOptions.IgnoreCase, "AbC", true);
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yield return ("(?m)^abc$", RegexOptions.Multiline, "abc\nabc", true);
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yield return ("(?s).", RegexOptions.Singleline, "\n", true);
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yield return ("(a*)*", RegexOptions.None, "", true);
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yield return ("(a*)+", RegexOptions.None, "", true);
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yield return ("(a+)*", RegexOptions.None, "", true);
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yield return ("(a?)*", RegexOptions.None, "", true);
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yield return ("(a{0,1})*", RegexOptions.None, "", true);
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yield return ("(a{0,2})*", RegexOptions.None, "", true);
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yield return ("a|b", RegexOptions.None, "ab", true);
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yield return ("a|b|c", RegexOptions.None, "abc", true);
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}
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[Theory]
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[MemberData(nameof(NimTestData))]
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public void NimTests(Regex regex, string input, bool expectedSuccess)
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{
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Assert.Equal(expectedSuccess, regex.IsMatch(input));
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}
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}
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}

‎src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/System.Text.RegularExpressions.Tests.csproj‎

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<Compile Include="RegexPcreTests.cs" />
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<Compile Include="RegexRe2Tests.cs" />
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<Compile Include="RegexRustTests.cs" />
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<Compile Include="RegexNimTests.cs" />
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</ItemGroup>
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<ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">

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