Regex Tester & Visualizer - Test Regular Expressions Online
2 uses
Email
URL
IPv4
Hex Color
Date
Phone
HTML Tag
Tips
Global Flag
Enable the g flag to find all matches, not just the first one
Case Insensitive
Use the i flag to match regardless of letter case
Capture Groups
Use parentheses () to create capture groups and extract parts of matches
Quick Start
Click any preset to load a common regex pattern instantly
Frequently Asked Questions
What regex flavor is used?
JavaScript regex engine is used, which supports most standard regex features including lookahead, lookbehind, and Unicode properties.
What do the flags mean?
g = global (all matches), i = case-insensitive, m = multiline (^ and $ match line boundaries), s = dotAll (. matches newlines), u = Unicode mode.
Can I test with multiline text?
Yes, paste multiline text into the test area and enable the m flag for line-based matching.
Can I use this regex visualizer to test email or URL validation patterns for my web forms?
Yes, this Regex Visualizer is ideal for developing and testing robust form validation patterns. You can easily input your specific regex, paste various valid and invalid test strings, and instantly see the matches and capture groups. The tool's built-in presets for common patterns like email addresses, URLs, and IP addresses also provide excellent examples, helping you ensure your web forms handle user input correctly.
How to Use the Regex Tester
- Enter your regular expression pattern in the pattern field
- Toggle the desired flags (g, i, m, s, u)
- Type or paste your test string in the text area
- Matches are highlighted in real time
- View match details and capture groups below
- Click a preset to load common patterns like Email or URL