Regex Learning Tool

Regex Learning Tool | Kloudbean Developer Tools

Regex Learning Tool

Test and learn regular expressions with real-time pattern matching and visual feedback.

Common Regex Patterns (Click to Use)

[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,} Email addresses

\b\d{3}-\d{3}-\d{4}\b Phone numbers (XXX-XXX-XXXX)

https?:\/\/... URLs

^[A-Z][a-z]+ Words starting with capital letter

\b\w{5,}\b Words with 5+ characters

Regular Expression Pattern:

g (global) i (ignore case) m (multiline) s (dotall)

Test Text:

1

The quick brown fox jumps over the lazy dog. 
Contact us at support@example.com or call 123-456-7890.
Visit our website at https://www.example.com for more info.
Some numbers: 42, 3.14159, -17, 1,000,000

Matches Found:

Enter a regex pattern and test text to see matches highlighted here.

Match Details:

1

How to Use the Regex Learning Tool

Enter your regular expression pattern in the regex field, add your test text, and click "Test Regex" to see matches highlighted in real-time. Use the checkboxes to add regex flags for different matching behaviors.

Understanding Regex Flags

Regex flags modify how patterns are matched:

g (global): Find all matches, not just the first one
i (ignore case): Case-insensitive matching
m (multiline): ^ and $ match line breaks
s (dotall): . matches newline characters

Common Regex Patterns for Developers

Regular expressions are essential for:

Form validation (emails, phone numbers, passwords)
Data extraction and parsing from logs or text files
Search and replace operations in code editors
URL routing and parameter extraction in web applications
Input sanitization and security validation

Regex in Cloud Development

When developing cloud applications with Kloudbean hosting, regex patterns help with log analysis, API validation, and data processing tasks that are common in distributed systems.

Frequently Asked Questions

Q. What regex flavor does this tool use?
This tool uses JavaScript's built-in RegExp engine, which follows ECMAScript regex standards.

Q. Why isn't my regex pattern working?
Check for unescaped special characters, mismatched brackets, or invalid flag combinations. The tool will show error messages for invalid patterns.

Q. How do I match literal special characters?
Escape special characters with a backslash: \. \* \+ \? \^ \$ \{ \} \( \) \| \[ \] \\

Q. What's the difference between .* and .*?
Both are the same - .* matches any character (except newline) zero or more times. Use the 's' flag to include newlines.

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