TOOL

Regex Escape String

Regex Escape String — pure client-side tool. Privacy-first, no server round-trip.

Input

Try an example:

Output

Local only

Recent history

No history yet

How to use

Type or paste your input into the input box.
Adjust any parameters if needed.
Copy or download the result.

Frequently asked questions

Is my data uploaded anywhere?: No. All processing happens locally in your browser with no server round-trip.
Does this tool work offline?: Yes. Once the page loads, the tool runs entirely client-side and needs no network connection.

Glossary terms

Regular Expression

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Regex Difference

Build a regex for 'strings matching pattern A but not pattern B' from two patterns, one per line. Semantics are asymmetric: A must match from the start of the string, while B is rejected if it occurs anywhere. Output shape: (?=A)(?!.*B).*

Regex Equivalent

Check whether two regexes match exactly the same strings — semantic equivalence via product-DFA analysis, with a shortest counterexample string when they differ. Input: two patterns on separate lines.