Which regex flags can I use?

Global, case-insensitive, multiline and dotAll flags are all supported and toggle live as you test.

Does Regex Tester upload my files to a server?

No. Regex Tester runs entirely in your browser using on-device processing, your files never leave your device.

Test regular expressions against sample text.

See it in action

PatternMatches

Pattern

//g

gims

Test text

File Converter

Convert data files between CSV, JSON and TSV.

JSON Formatter

Format, validate and minify JSON.

Base64 Converter

Encode or decode text and files as Base64.

URL Encoder/Decoder

Encode or decode URLs and query strings.