regist

A declarative, type-safe, and human-readable library for string validation and transformation.

npm install @regist/regist

Stop Fighting with Regex

Write readable, maintainable string logic that everyone on your team can understand.

Validating a strong password (8+ chars, uppercase, lowercase, digit, special char) is cryptic and error-prone.

const regex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*d)(?=.*[^A-Za-z0-9]).{8,}$/;

regex.test("Aa1!aa11"); // true

Use a declarative, fluent API that reads like plain English and prevents bugs.

import { assertThat } from 'regist';

assertThat("Aa1!aa11")
  .isStrongPassword()
  .try(); // true

Describe string logic in a human-readable way, not with cryptic regex.

Catch errors at compile time, not runtime, with excellent autocompletion.

No extra baggage. Just a lightweight library to keep your project lean.

Seamlessly switch between validation and transformation APIs in one chain.

Build logic once, then reuse, branch, and compose it anywhere you need.

Easily add your own custom logic with customCheck() and customTransform().