Caret

Caret is a free, offline regular-expression workbench for your pocket. Write a pattern and watch it match live, inspect every capture group, preview replacements — then flip to a plain-English explanation that breaks the pattern down token by token. A searchable cheatsheet and a library of ready-made patterns get you moving fast. FEATURES • Live match highlighting with capture groups and replace preview • Plain-English, token-by-token explainer • ICU and JavaScript engines — both run fully on-device • Flavor-aware explanations (also PCRE, Python, .NET) • Searchable syntax cheatsheet with one-tap insert • Library of common patterns — email, URL, IP, UUID, date, and more • Save and reuse your own patterns • Catastrophic-backtracking warnings so a bad pattern never hangs • Works completely offline · Dark mode · No ads, no accounts, no tracking