What are regex flags?

Regex flags modify how the pattern matching works. Common flags include: g (global - find all matches), i (case-insensitive), m (multiline), and s (dotall - dot matches newlines).

How do I test regex for different programming languages?

While regex syntax is mostly standardized, some languages have slight differences. Our tool uses JavaScript regex engine, which is similar to most languages but may have minor variations in advanced features.

Regex Tester

Test and debug regular expressions

Regular Expression Pattern

Flags

Test String

About This Tool

Test and debug regular expressions with our powerful regex tester. See real-time pattern matching, highlighted matches, capture groups, and detailed explanations. Essential for developers working with text processing, validation, search patterns, and data extraction.

Enter your regular expression pattern
Add test text to match against
View matches highlighted in real-time
See capture groups and match details
Adjust flags (global, case-insensitive, multiline)

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About This Tool

How to Use

Features

Use Cases

Frequently Asked Questions

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