Utiloom
Developer Tools

Regex Tester

Test regular expressions against sample text and inspect matches instantly.

Test and debug regular expressions

Live preview

3 matches
Utiloom ships fast tools. Regex helps test patterns. JSON Diff is useful.

Flags help

gFind all matches
iIgnore letter case
mTreat each line as separate for ^ and $
sLet dot match new lines
uEnable Unicode mode

Matches

3

Capture groups

This match does not include capture groups.

About this tool

Validate regex patterns quickly by checking matches, positions, and flags against sample text in the browser.

  • Supports custom regex patterns and flags.
  • Shows every match and its index in the text.
  • Useful for validation rules, parsing, and debugging.

How to use Regex Tester

Open the interactive panel above, enter your content, and review the output instantly. Utiloom keeps processing in the browser whenever possible so you can move faster without adding server complexity.

Why people use this tool

Search-friendly utility pages work well when they answer a focused job clearly. This page includes descriptive metadata, structured copy, and FAQs to support both visitors and search engines.

Frequently asked questions

Can I test global and multiline regex flags?

Yes. Enter the flags you want to use, such as g, i, or m.

Does the tool execute code?

No. It only evaluates JavaScript regular expressions in the browser.