Overview
The characters package provides Unicode-aware string manipulation in Dart, ensuring operations like indexing and replacement respect grapheme clusters—sequences of code points that form a single visible character. It enables safe and accurate text processing for internationalized applications, particularly where users input complex scripts or emoji. The package extends String with a Characters class that handles edge cases such as combining marks and surrogate pairs correctly.
Use cases
- Internationalized text processing
- Emoji and complex script handling
- Safe string slicing and indexing
- Text editing with correct cursor positioning
- Accurate string length calculations
- User input validation
Key features
- Grapheme cluster awareness
- Unicode-safe string operations
- Extends String with Characters class
- Supports all major platforms
- Immutable and efficient design
- Comprehensive test coverage
Suitable for
- Apps targeting global audiences
- Text editors and input fields
- Localization and i18n projects
- Applications using emoji or non-Latin scripts
- Developers needing precise string manipulation
Considerations
- Adds minimal overhead
- Requires explicit use of Characters class
- Not needed for simple ASCII-only strings
- Limited to string operations only
- No runtime dependency on other packages