Developer Utilitiesimplementedregexbuilderdeveloper

Regex Builder

Build common regular expressions from readable options.

Privacy note: All processing runs locally in your browser. Nothing is uploaded or sent to external APIs.

Pattern presetFlags

Starts with Ends with Global Ignore case Multiline

/[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}/gi

[
  {
    "match": "hello@example.com",
    "index": 6
  }
]

How it works: The builder assembles a JavaScript RegExp from safe presets, anchors, and flags, then tests it locally against your sample text.