# Multiple Start Rules
Chevrotain supports using any of the grammar rules as a starting rule. This means that any subset of a language can be parsed without being wrapped in other constructs, For example this can be used for:
- Implementing "debugger watch expressions" and "evaluate expression" in an IDE.
- Parsing only modified text in an IDE for performance.
- Easy unit testing for small language snippets.
See executable example (opens new window) for further details.