Text sorter
Sort lines alphabetically or numerically, in either direction.
Text & writingRegex tester
Test JavaScript regular expressions with matches, offsets and capture groups.
Ready when you are.
◎ No uploads. Your input stays here.↗ Free to use. No account needed.⌘ / Ctrl + Enter to run
A worked example
Indices are zero-based JavaScript string positions. This example finds an email-like string; it is not comprehensive email validation.
Input / settings
Text: [email protected] Pattern: [\w.+-]+@[\w.-]+\.[a-zA-Z]{2,} Flags: gi
Expected result
1 match: [email protected], starting at index 0
A LITTLE GUIDANCE
How to use Regex tester
Enter a pattern without slash delimiters, flags and sample text. Matching runs in a time-limited worker.
Good to know
Uses the JavaScript regex engine. PCRE-specific syntax is not supported; expensive expressions are stopped after one second.
A few quick answers.
Why does a valid pattern time out?
Some patterns have excessive backtracking. The test runs in a worker and stops after one second. Try fewer nested quantifiers or shorter input; results are capped at 1,000 matches.
Is my input sent to a server?
No. This tool processes your input in your browser. We don't store your text, files or results. Standard website access logs are separate; read our privacy notes.
Can I use it for free?
Yes. No account, subscription or usage credits are required.
How do I keep my result?
Use Copy or Download after running the tool. Inputs are not saved automatically and disappear when you leave or refresh the page.
Something not right? Report a problem with this tool. Include the steps, but never passwords or private input.