Regex Cheat Generator

Quickly generate implementation-ready regex patterns for common targets such as email, URL, UUID, JWT, and dates.

Template

Full match (^...$)

i flag (ignore case)

m flag (multiline)

Min length Max length

Generated Result

Status

Runs in your browser. No input is sent to a server.

How to use

Choose a template, tune options, and click Generate. Validate with Regex Tester on real data before production use.

Allowed characters vary by requirement; always verify final regex against real business data.
Complex regex can impact performance (consider ReDoS safety).

Pick a use-case template (email/url/uuid, etc.) to generate a regex pattern and suggested flags.

Toggle options like full-string match or case-insensitive mode to create a practical starting point before coding.

Generated output is a starting point. Adjust for your business requirements (i18n, edge cases).
Behavior can differ across regex engines (JavaScript/PCRE/RE2).

Can I use generated patterns directly in production?

Validate with real data first. Allowed/forbidden characters depend on your requirements, so final tuning is necessary.

How is this different from Regex Tester?

This page is for generation; Regex Tester is for verification. Use them in sequence (generate → test).

These links are generated from site_map rules in recommended diagnostic order.

.env Diff Checker — Compare .env added/removed/changed keys
Regex Tester — Test regex matching, extraction, and replacement
SQL WHERE Builder — Build WHERE clauses and bind params from condition rows
Text Counter — Count characters including newline and full/half-width views
Mahjong Point Calculator — Calculate point movement on win from han/fu, honba, and kyotaku
Mahjong All-Last Calculator — Compute ron/tsumo conditions needed to reach target rank from current scores
Unix Time Converter — Convert Unix seconds/milliseconds and date-time both ways
Cron Builder — Build 5-field cron and preview upcoming runs

One-screen calculators for commonly forgotten quick math

Mahjong Point Calculator — Calculate point movement on win from han/fu, honba, and kyotaku
Mahjong All-Last Calculator — Compute ron/tsumo conditions needed to reach target rank from current scores
Unix Time Converter — Convert Unix seconds/milliseconds and date-time both ways
Cron Builder — Build 5-field cron and preview upcoming runs
Text Counter — Count characters including newline and full/half-width views
Regex Tester — Test regex matching, extraction, and replacement
SQL WHERE Builder — Build WHERE clauses and bind params from condition rows
SQL UPSERT Builder — Generate dialect-specific UPSERT SQL and bind values
Random Token Generator — Generate random tokens with selectable byte size and encoding