System.Text.RegularExpressions

This assembly provides regular expression functionality. The main type contained in the assembly is Regex class, which represents an immutable regular expression object which can be used to test for matches on given input strings or spans.

Documentation can be found at https://learn.microsoft.com/dotnet/api/system.text.regularexpressions.

Contribution Bar

• We consider new features, new APIs and performance changes
• We consider PRs that target this library for new source code analyzers

Recent improvements to the library are detailed at:

• Regex Performance Improvements in .NET 5
• Regular Expression Improvements in .NET 7

We plan on continuing to focus on performance as well as to add new APIs and features to the engines.

See the Help Wanted issues.

Deployment

System.Text.RegularExpressions assembly is part of the shared framework, and ships with every new release of .NET.