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Regex Tester

Test JavaScript regular expressions with live highlights, capture groups, replace, and split. Flag toggles and common presets included.

PrivateIn your browserInstantUnlimited
Contact us at hello@easy24.tools or visit https://easy24.tools/docs. Order #1042 shipped on 2026-03-15.
1 matches

Uses JavaScript RegExp syntax. Without global (g), only the first match is listed. Replace mode uses $1, $2 for capture groups.

How it works

1

Set pattern and flags

Type a regex pattern or pick a preset (email, URL, IPv4). Toggle g/i/m/s/u/y flags or edit the flags field directly.

2

Paste test text

Paste or type sample text. In Match mode, hits highlight in yellow below the input. Capture groups and indexes appear in the results panel.

3

Replace, split, or export

Switch to Replace to preview substitutions ($1 for groups) or Split to break on the pattern. Copy or download the output.

Why test regex in the browser?

Regular expressions are powerful but easy to get wrong. A live tester lets you iterate on patterns against real sample data before dropping them into code, validators, or find-and-replace workflows.

Why use this tool

  • Live match highlighting
  • Capture groups and match indexes
  • Match, Replace, and Split modes
  • Flag toggles and regex presets
  • Up to 200 matches listed
  • Unlimited — no daily cap

Questions

What regex flavor is supported?

JavaScript RegExp as implemented in your browser — not PCRE or Python syntax.

Why only one match without the g flag?

Without global (g), RegExp stops after the first match. Enable g to find all occurrences.

How do capture groups work in Replace?

Use $1, $2, … for numbered groups and $<name> for named groups in the replacement string. $$ inserts a literal dollar sign.

Is highlighted output safe?

Yes. Highlights are React elements, not injected HTML from your regex.

Is my data sent to a server?

No. Testing runs entirely in this tab.

Is there a daily limit?

No. This tool has no daily cap.

If Easy24 helped, buy a coffee

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