Does the text leave this browser?

No. The trial finishes in the browser you have open.

Why does it stop after 1 second?

Nested repeats can grow without end, so it cuts off before the page freezes.

Only matches that captured something in parentheses are listed below, up to 50.

Home Regex tester

Flags g, i, m, s, and u are here, plus common patterns. It stops after 10,000 matches.

Pattern

Common patterns

Text

You can check whether a log line, an address, or a date fits a pattern before running it in code.

What a pair of parentheses captured is listed next to the match.

01How to use it

Put the pattern between the slashes and choose the flags.

Matching stretches in the text below are colored, and captured groups are listed apart.
02What you get

The date example finds five places, such as 2024-03-15 and 2024/12/31.

Email, URL, IP, and Korean phone patterns can be filled in at once.

Entered2024-03-15

날짜 5
03Worth knowing

Without g, only the first match appears.

A grammar error is explained in a sentence: parentheses, a range, or a flag.

날짜	5

QDoes the text leave this browser?: ANo. The trial finishes in the browser you have open.
QWhy does it stop after 1 second?: ANested repeats can grow without end, so it cuts off before the page freezes.
QWhere do the groups appear?: AOnly matches that captured something in parentheses are listed below, up to 50.