Skip to content

Add tests for lazy quantifier inside optional group #125474

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
danmoseley merged 1 commit into from
Mar 12, 2026
Merged

Add tests for lazy quantifier inside optional group #125474

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 5 additions & 0 deletions src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/Regex.Match.Tests.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -385,6 +385,11 @@ public static IEnumerable<object[]> Match_MemberData()
yield return (@"(\(.*?\))+?;", "(a)b);", RegexOptions.None, 0, 6, true, "(a)b);");
yield return (@"(\(.*?\))*;", "(a)b);", RegexOptions.None, 0, 6, true, "(a)b);");
yield return (@"(\(.*?\))*?;", "(a)b);", RegexOptions.None, 0, 6, true, "(a)b);");
// Lazy quantifier inside optional group where the lazy loop must expand for the rest of the pattern to match.
yield return (@"a(b.*?c)?d", "abccd", RegexOptions.None, 0, 5, true, "abccd");
yield return (@"a(b.*?c)?d", "abcd", RegexOptions.None, 0, 4, true, "abcd");
yield return (@"a(b.*?c)?d", "ad", RegexOptions.None, 0, 2, true, "ad");
yield return (@"a(b.*?c)?d", "abce", RegexOptions.None, 0, 4, false, string.Empty);
// Non-backtracking body: optimization correctly applies. These verify bodies without backtracking
// inside the outer loop are still correctly matched after the outer loop is made atomic.
yield return (@"\w+(\(abc\))?,", "Foo(abc),", RegexOptions.None, 0, 9, true, "Foo(abc),");
Expand Down
Loading