Regular Expression (Regex) Replace

Find and substitute text using powerful regular expression patterns and capture flags (g, i, m, s).

How It Works & Processing Standards

Find and substitute text using powerful regular expression patterns and capture flags (g, i, m, s).

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 2,000,000 characters

Regular Expression (Regex) Replace is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use Regular Expression (Regex) Replace

  1. 1
    Paste TextEnter text to transform.
  2. 2
    Write Regex & FlagsEnter regex pattern, flags, and replacement expression.
  3. 3
    Copy OutputSave your transformed text.

Common Use Cases

  • Reformatting date strings from YYYY-MM-DD to DD/MM/YYYY using capture groups
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