Which regex flavour is used?

JavaScript ECMAScript regex (the same as your browser).

Does it support lookbehind?

Yes in modern browsers that support ES2018+ lookbehind.

What flags are supported?

g (global), i (case-insensitive), m (multiline), s (dotAll), u (unicode), y (sticky).

Workova

Developer Tools

Regex Tester

Test JavaScript regular expressions with live match highlighting and capture groups.

Regular expressions are tricky; a live tester with highlighting removes the guesswork.

Pattern (JavaScript regex)

Test string

Matches: 2

#1 @ 12: “alice@example.com” • groups: [“alice”, “example.com”]
#2 @ 33: “bob@workova.co” • groups: [“bob”, “workova.co”]

Privacy

Runs entirely in your browser. Nothing is uploaded or logged.

Who is this for?

Developers writing validation, parsing, or search rules.

How to use Regex Tester

Enter a regex and flags.
Enter your test string.
See highlighted matches and captured groups.

Practical examples

Match email addresses with \\b(\\w+)@(\\w+\\.\\w+)\\b.

Benefits

Live highlighting.
Capture groups listed per match.
Supports all JavaScript flags: g, i, m, s, u, y.

Limitations

JavaScript regex flavour only — PCRE features like lookbehind are supported only where JS engines support them.

Common mistakes

Forgetting to escape backslashes when copy-pasting from other languages.
Confusing greedy vs lazy quantifiers (`.*` vs `.*?`).

Frequently asked questions

Related tools

Developer

JSON Formatter

Format, validate, and minify JSON with helpful error messages.

Open tool

Developer

Base64 Encoder

Encode text to Base64, including Unicode text.

Open tool

Developer

Base64 Decoder

Decode Base64 strings back to text, including Base64URL.

Open tool

Developer

UUID Generator

Generate random v4 UUIDs; up to 200 at a time.

Open tool

Explore more free tools

We have dozens of free productivity tools — no signup required.

Browse all tools

Developer Tools

Regex Tester

Test JavaScript regular expressions with live match highlighting and capture groups.

Regular expressions are tricky; a live tester with highlighting removes the guesswork.

Pattern (JavaScript regex)

Test string

Matches: 2

#1 @ 12: “alice@example.com” • groups: [“alice”, “example.com”]
#2 @ 33: “bob@workova.co” • groups: [“bob”, “workova.co”]

Privacy

Runs entirely in your browser. Nothing is uploaded or logged.

Who is this for?

Developers writing validation, parsing, or search rules.

How to use Regex Tester

Enter a regex and flags.
Enter your test string.
See highlighted matches and captured groups.

Practical examples

Match email addresses with \\b(\\w+)@(\\w+\\.\\w+)\\b.

Benefits

Live highlighting.
Capture groups listed per match.
Supports all JavaScript flags: g, i, m, s, u, y.

Limitations

JavaScript regex flavour only — PCRE features like lookbehind are supported only where JS engines support them.

Common mistakes

Forgetting to escape backslashes when copy-pasting from other languages.
Confusing greedy vs lazy quantifiers (`.*` vs `.*?`).

Frequently asked questions

Related tools

Developer

JSON Formatter

Format, validate, and minify JSON with helpful error messages.

Open tool

Developer

Base64 Encoder

Encode text to Base64, including Unicode text.

Open tool

Developer

Base64 Decoder

Decode Base64 strings back to text, including Base64URL.

Open tool

Developer

UUID Generator

Generate random v4 UUIDs; up to 200 at a time.

Open tool

Explore more free tools

We have dozens of free productivity tools — no signup required.

Browse all tools