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Text & Regex

Regex Builder

Compose regular expressions from reusable building blocks and watch them match your sample text live. Everything runs in your browser — your patterns and text never leave the page.

Runs in your browser v1.0.0

Your regular expression

live

Building blocks

compose
Start from a preset
    Anchors
    Flags

    Sample text

    live match

    How it works

    Each block contributes one piece of the pattern: character types, literal text, or a ready-made fragment such as an email address. Reorder blocks to change the sequence, attach a repeat count, and mark a block as a capture group to reuse its value. Presets are just pre-built block sequences, so you can start from one and adjust it. Invalid patterns are reported with a readable message instead of a browser exception. Use Copy share link to put your blocks, flags and sample text in the URL.

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