Regex Generator

Use presets for common validations or build a custom regex from text.

Custom Text

Build a pattern from your own text.

Edit the text to generate a pattern.

Match Mode

Options

Flags

Generated Regex

/Invoice INV-2026-042/gi
/api/regex?preset=custom&flags=gi&text=Invoice+INV-2026-042&mode=contains&escape=1
Presets are practical defaults and may not cover every edge case. Always validate inputs on the server.

Guide

Regex Generator Guide

Build regular expressions with common modes and flags. Useful for validation patterns and search utilities.

How It Works

  • Enter the sample text you want to match.
  • Choose a mode such as contains or starts-with.
  • Copy the generated regex pattern.

Practical Tips

  • Test your regex on multiple sample strings.
  • Use the i flag for case-insensitive matching.
  • Keep patterns simple to avoid backtracking issues.

FAQs

Is the regex escaped?

You can toggle escaping for safety.

Which flags are supported?

Standard flags like g and i.

Is it language-specific?

The output is compatible with JavaScript regex.