Test JavaScript regular expressions with flags, match highlighting and capture groups.
Developer/\b\w+@\w+\.\w+\b/gType your regular expression in the pattern field (without the surrounding slashes).
Enter the test string in the text area below the pattern field.
Toggle flags (g, i, m, s) using the flag buttons to change matching behavior.
All matches are highlighted in real time; capture groups appear in the panel below.
Copy the pattern or any matched group value with the copy button.
Input and settings
Pattern: ORD-\d{4}
Flag: g
Text: ORD-0042 and ORD-1200Expected result
Two matches: ORD-0042, ORD-1200.Use the pattern without / delimiters. This finds four digits after ORD-; it is not full validation of an order record.
Write and test patterns for email, phone number, or Thai ID validation before shipping.
Extract timestamps, error codes, or IP addresses from server log samples.
Prototype a pattern before using it in a sed, awk, or code replace operation.
Experiment interactively to understand why a pattern matches or doesn't.
Test regular expressions live with match highlighting and capture group extraction. Useful for developers writing form validation, log parsing, or any text-search task โ and for learners debugging why their pattern doesn't match.
Found incorrect guidance or a result? Send the team steps and a non-sensitive example.
Convert a JSON array of objects into CSV text for copying or download.
Format, minify and check JSON syntax with selectable indentation in your browser.
Encode UTF-8 text as Base64 or decode Base64 back to text; this is not encryption.
Encode or decode a URL component using percent encoding.
Convert YAML to JSON or JSON to YAML, then inspect the resulting data types.
Inspect JWT header and payload data without verifying its signature or authenticity.