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Regular Expression Tester

List regex matches and capture groups in a worker with a time limit.

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Regex tester online

Test a JavaScript regular expression against sample text. A worker time limit bounds a run; other regex engines may interpret the same pattern differently.

How to use it

Enter the source input or select Try example. Review Pattern, Flags. Select Run tool and inspect the result before copying or downloading.

Options and example settings

Option	Choices / value	Example default
Pattern	Enter a value	\d+
Flags	Enter a value	g

Worked examples

Test a JavaScript regular expression against sample text.

Worked example — Regular Expression Tester

Settings: Pattern: \d+; Flags: g

Input:

Order 123, order 456

Output:

[
  {
    "index": 6,
    "match": "123",
    "groups": [],
    "namedGroups": null
  },
  {
    "index": 17,
    "match": "456",
    "groups": [],
    "namedGroups": null
  }
]

The example returns 2 top-level items in an array. Each item is a record; the first record contains “index”, “match”, “groups”, “namedGroups”.

Limitations and common mistakes

A worker time limit bounds a run; other regex engines may interpret the same pattern differently.

Frequently asked questions

How can I test a regular expression online?

Enter the source input or select Try example. Review Pattern, Flags. Select Run tool and inspect the result before copying or downloading.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.