How to use Regex Find & Replace

Preview a JavaScript regular-expression replacement with match counts and strict size limits.

1. Paste, type, or drag and drop a supported text file into the input area.
2. Place the second value in the adjacent panel. Sensitive fields are masked by default.
3. Choose the options that match your intended result.
4. Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.

Use “Swap inputs” to reverse the comparison without copying either value.

What the result means

The replaced text plus a count of matched segments.

Privacy and safety

This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.

Limitations

• Uses the browser JavaScript regex engine in a disposable local worker with a two-second safety limit. Replacement presets are intentionally constrained.

Try the included example

Select “Load example” at any time to restore this tested sample.

\b([A-Za-z]+)\s+\1\b

This is is a local local test.