Question 1

What is a Regex Tester?

Accepted Answer

A Regex Tester (Regular Expression Tester) is a tool that helps you test and debug regular expression patterns against sample text. It shows matches in real-time, helping you validate and refine your regex patterns before using them in code.

Question 2

How do I test a regex pattern?

Accepted Answer

Enter your regular expression pattern in the regex input field, then add your test text below. The tool will highlight all matches in real-time and show you capture groups, allowing you to verify your pattern works correctly.

Question 3

What regex flags are supported?

Accepted Answer

Our Regex Tester supports all common flags: g (global), i (case-insensitive), m (multiline), s (dotall), u (unicode), and y (sticky). You can combine multiple flags to customize pattern matching behavior.

Question 4

Can I save my regex patterns?

Accepted Answer

While we don't have built-in saving, you can bookmark patterns in your browser or copy the URL (some browsers support sharing regex in URLs). Your patterns are also preserved in browser session storage while you work.

Question 5

Does Regex Tester explain my regex?

Accepted Answer

Yes! Our tool provides visual highlighting of matches and shows capture groups. For complex patterns, hover over elements to see explanations of what each part of your regex does.

RegEx Tester

About this Tool

Regular Expression

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