Text Processing

These tools handle the text work that comes up while coding, digging through logs, and checking config files. You get a regex tester that shows matches as you type, a visual diff between two texts, a list comparison that pulls out common and differing lines, and a slug converter that turns a heading — including Japanese — into a URL-friendly form.

Regex Tester

Enter a regular expression pattern and a test string to highlight matches and list capture group values. Supports the g/i/m/s/u flags using JavaScript's native RegExp.

Text Diff Comparison

Compare two blocks of text line by line and see added and removed lines highlighted in color. Useful for checking config file changes, proofreading documents, or reviewing code without Git. All diffing happens in your br...

List Compare Tool (Common & Unique Lines)

Compare two text lists (one item per line) and instantly extract the lines common to both, the lines only in A, and the lines only in B using set operations. Useful for matching mailing lists or checking inventory duplic...

URL Slug Generator

Convert any text into a URL-safe slug (kebab-case) made only of lowercase letters, digits, and hyphens. Includes an optional simplified Japanese romanization mode for hiragana and katakana.