Regex Tester
Test JavaScript regular expressions, inspect matches and groups, and preview replacements locally.
Test Regular Expressions Online
Vamriko Regex Tester helps you test a regular expression against sample text and inspect the matches produced by your pattern. It is useful when developing, debugging, or refining patterns for text processing and validation tasks.
Enter a regular expression and provide test text to quickly see whether the pattern matches the content you are working with.
How to Use the Regex Tester
1. Enter the pattern
Type the regular expression you want to test into the pattern field.
2. Add sample text
Enter or paste representative text that you want the regular expression to inspect.
3. Review the matches
Check the displayed results and refine the pattern when it does not match the text as expected.
Regex Tester FAQ
What is a regular expression?
A regular expression, or regex, is a pattern used to search, match, and work with text according to defined rules.
What can I test with a regex tester?
You can test patterns against sample text to inspect whether expected characters, words, sequences, or structures are matched.
Why does my regular expression return no matches?
The pattern may not describe the supplied text as expected. Check the characters, anchors, quantifiers, escaping, and available expression options.
Can a regex tester help debug a pattern?
Yes. Testing a pattern against representative sample text makes it easier to identify unexpected matches and missing matches.
Should I test regex patterns with realistic text?
Yes. Representative examples can reveal edge cases that may not appear when testing only a simple sample.