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Regex Tester

Test and debug regular expressions in real-time

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About This Tool

A real-time regular expression testing tool that lets you write, test, and debug regex patterns instantly. Features flag toggles, quick pattern shortcuts for common formats, match highlighting with position details, and helpful utilities like regex escaping and sample data loading.

Key Features

Quick Preview

Use Cases

regex datetime

Frequently Asked Questions

What regex flags are supported?

The tool supports four common flags: g (Global) to find all matches, i (Case Insensitive) to ignore letter case, m (Multiline) to make ^ and $ match line boundaries, and s (Dot All) to make the dot match newlines. You can combine any of these flags.

How do the quick pattern shortcuts work?

The quick pattern buttons insert commonly used regex patterns directly into the pattern field. For example, clicking Email inserts a pattern that matches standard email addresses, and URL inserts a pattern for HTTP/HTTPS URLs. This saves time when testing common formats.

What does the Escape HTML button do?

The Escape HTML button escapes special regex characters in your pattern (like ., *, +, ?, ^, $, etc.) by adding backslashes before them. This is useful when you want to match literal text that contains characters that would otherwise be interpreted as regex metacharacters.

Why is my regex showing an error?

Regex errors occur when the pattern syntax is invalid, such as unmatched parentheses, incorrect quantifier usage, or invalid escape sequences. The tool displays the specific error message to help you identify and fix the issue in your pattern.

Can I test patterns against multi-line text?

Yes, you can enter multi-line text in the test area. Enable the m (Multiline) flag to make ^ and $ match the start and end of each line rather than the entire string. Enable the s (Dot All) flag if you want the dot (.) to match newline characters as well.