How does the regex tester work?

Our regex tester validates your regular expression pattern and shows live matches against your test string with highlighting.

Can I save my regex patterns?

Yes! You can save patterns to favorites and access your history of recently used patterns.

Does it support all regex flags?

Yes, we support all standard regex flags including global (g), case-insensitive (i), multiline (m), and more.

What is a regular expression (regex)?

A regular expression (regex) is a sequence of characters that defines a search pattern. Regex is used to match, search, and manipulate text strings. It's a powerful tool for pattern matching, validation, and text processing in programming.

How does the regex tester work?

Our regex tester allows you to enter a regular expression pattern and test it against sample text. It shows matches in real-time, highlights matched text, and provides detailed information about the regex pattern. All processing happens 100% client-side in your browser.

What regex features are supported?

Our regex tester supports standard regex features including character classes, quantifiers, anchors, groups, alternation, lookahead/lookbehind, and flags (global, case-insensitive, multiline). It follows JavaScript regex syntax.

Is my test data stored?

No, all regex testing happens locally in your browser. We never transmit, store, or log your regex patterns or test text. Your privacy is completely protected.

Can I use this for learning regex?

Yes, our regex tester is perfect for learning. It provides real-time feedback, shows matches visually, and includes pattern presets and examples to help you understand how regex works.

Is this regex tester free?

Yes, our regex tester is completely free to use with no registration required. All processing happens locally in your browser.

🔍 Regex Tester & Generator

Test and generate regular expressions with live matching, pattern presets, and code snippets. 100% client-side processing.

Matches (0)

No matches found

💻 Code Snippets

javascript

const regex = //g;
const matches = text.match(regex);

python

import re
regex = re.compile(r'', re.G)
matches = regex.findall(text)

php

$pattern = '//g';
$matches = preg_match_all($pattern, $text, $results);

📚 History

No history yet

⭐ Favorites

No favorites yet

🔍 What is Regex?

Regular expressions are patterns used to match character combinations in strings.

Common Uses:

Data validation
Text processing
Search and replace
Pattern matching

🏷️ Common Flags

g - Global (find all matches)

i - Case insensitive

m - Multiline

s - Dot matches newline

u - Unicode

y - Sticky

🔒 Security

✅ Privacy Guarantee

All processing happens client-side. Your data never leaves your device!

💡 Pro Tip

Use anchors (^$) for exact matches, quantifiers for repetition.

❓Frequently Asked Questions - Regex Tester

📢

Advertisement Space

Ad will appear here

🔗 Related Tools