In C#, a regex is just a string. When the pattern is not simple, it can be hard to understand it. Visual Studio 2019 comes with some improvements to help you working with regexes.
Each part of the pattern is colorized. It's easy to distinguish special characters, groups, quantifiers, comments, etc.:
The colorization depends on the regex options:
IntelliSense helps you to write the regex pattern. It helpful to discover the syntax or to autocomplete character categories:
To quickly find where the group starts or ends, Visual Studio highlight the matching parentheses:
When you see a backreference in the pattern, it is not easy to find the referenced group, especially for numbered backreferences. To quickly identify the referenced group, Visual Studio highlight it when your cursor is on a backreference:
If the pattern is not valid, you'll get an error at runtime. What you want is to detect errors as soon as possible. Visual Studio reports errors in the pattern, so you can fix it:
Visual Studio automatically detects the string used in Regex methods (Regex constructor or static methods). But you may need to construct a string with the pattern before using it in a Regex method. You can instruct Visual Studio to consider any string as a regex pattern using a comment. You can also set the regex options in the comment.
The comment can be just before the string using
/* language=regex */ or on the preceding line using
// language=regex. Use a comma to add the regex options.
If the above functionalities doesn't work, check your Visual Studio settings:
This post is part of the series 'Visual Studio Tips and Tricks'. Be sure to check out the rest of the blog posts of the series!
- View and edit the Tab Order of Windows Forms Controls
- Comparing files using Visual Studio
- Visual Studio Tips and tricks: Clipboard history
- Visual Studio Tips and tricks: Open recently closed files
- Visual Studio Tips and tricks: Multi-line and multi-cursor editing
- Visual Studio Tips and tricks: Extend/Reduce selection
- Visual Studio Tips and tricks: Undock/Re-dock a tool window
- Visual Studio Tips and tricks: Regex editing (this post)
- Visual Studio Tips and tricks: Find the current opened file in the solution explorer
- Visual Studio Tips and tricks: Default startup project
- Visual Studio Tips and tricks: Open the documentation of a symbol
- Visual Studio Tips and tricks: Paste as JSON