stringr

stringr

A comprehensive string manipulation library for Dart and Flutter. Inspired by VocaJS, stringr provides powerful string operations that work seamlessly with Latin, non-Latin, and Unicode strings.

Features

• Case Conversion - camelCase, snake_case, kebab-case, Title Case, PascalCase
• Unicode Support - Full support for non-Latin scripts, diacritics, and grapheme clusters
• Smart Word Detection - Uses regex patterns instead of simple whitespace splitting
• Null Safety - Fully null-safe and compatible with Dart 3.0+
• Zero Dependencies - Only depends on the characters package for grapheme support

Installation

Add to your pubspec.yaml:

dependencies:
  stringr: ^1.2.0

Quick Start

import 'package:stringr/stringr.dart';

void main() {
  // Case conversions
  print('hello world'.toCamelCase);        // helloWorld
  print('hello world'.toSnakeCase);        // hello_world
  print('hello world'.toKebabCase);        // hello-world
  print('hello world'.toPascalCase);       // HelloWorld

  // Smart word extraction
  print('XMLHttpRequest'.camelCase());     // xmlHttpRequest
  print('/path/to/file'.camelCase());      // pathToFile
  print('2infinity&beyond'.words());       // [2, infinity, beyond]
}

Unicode & Non-Latin Support

stringr shines with complex Unicode strings:

// Non-Latin scripts
print('полет птицы'.kebabCase());          // полет-птицы
print('La variété française'.prune(12));   // La variété

// Diacritics and latinization
print('café'.latinize());                  // cafe
print('anglikonų šiurkščios'.latinize());  // anglikonu siurkscios

// Grapheme-aware operations
print('café'.countGrapheme());             // 4 (not 5!)
print('👨‍👩‍👧‍👦'.reverse());                      // 👨‍👩‍👧‍👦 (family emoji stays intact)

API Overview

Case Manipulation

Method	Description	Example
camelCase()	Convert to camelCase	'foo bar' → 'fooBar'
snakeCase()	Convert to snake_case	'foo bar' → 'foo_bar'
kebabCase()	Convert to kebab-case	'foo bar' → 'foo-bar'
titleCase()	Capitalize each word	'foo bar' → 'Foo Bar'
capitalize()	Capitalize first char	'foo' → 'Foo'
swapCase()	Toggle case	'FoO' → 'fOo'

String Chopping

Method	Description	Example
truncate(n)	Truncate to n chars	'hello world' → 'hello...'
prune(n)	Truncate without breaking words	'hello world' → 'hello'
first(n)	Get first n chars	'hello' → 'hel'
last(n)	Get last n chars	'hello' → 'llo'
slice(start, end)	Extract substring	'hello' → 'ell'

Counting

Method	Description	Example
countGrapheme()	Count visible characters	'café' → 4
countOccurrences(s)	Count substring occurrences	'banana'.countOccurrences('a') → 3
countWords()	Count words	'hello world' → 2
countWhere(fn)	Count matching chars	Custom predicate

Manipulation

Method	Description	Example
reverse()	Reverse (grapheme-aware)	'hello' → 'olleh'
slugify()	URL-friendly slug	'Hello World!' → 'hello-world'
latinize()	Remove diacritics	'café' → 'cafe'
insert(s, i)	Insert at position	'hllo'.insert('e', 1) → 'hello'

Escaping

Method	Description
escapeHtml()	Escape HTML entities
unescapeHtml()	Unescape HTML entities
escapeRegExp()	Escape regex special chars

Why stringr?

Most string libraries fail with complex Unicode. stringr handles:

• Grapheme clusters: 'café' is 4 characters, not 5
• Surrogate pairs: Emoji and special symbols work correctly
• Non-Latin scripts: Cyrillic, Greek, accented Latin, and more
• Smart word detection: 'XMLHttpRequest' → ['XML', 'Http', 'Request']

Contributing

Contributions are welcome! Please read our Contributing Guide for details.

Project Health

• Contributing Guide
• Code of Conduct
• Security Policy
• Support Guide

License

MIT License - see LICENSE for details.