en/tools/regex_learning_center

Welcome to the Regex Learning Center! Here you will find resources to help you learn and master Regular Expressions.

What is a Regular Expression?

A Regular Expression (often shortened to "regex" or "regexp") is a sequence of characters that defines a search pattern, often used for string pattern matching with certain string operations like "find and replace", "split", and "match".

Common Use Cases

• Search and Replace: Find and replace text in a document or code.
• Data Validation: Validate input data like email addresses or phone numbers.
• Parsing: Extract specific information from text or data.

Getting Started

To help you get started, here are some essential regex patterns:

• \d: Matches any digit.
• \w: Matches any word character (alphanumeric or underscore).
• \s: Matches any whitespace character.
• .*: Matches any character (except for line terminators) 0 or more times.

Resources

• Regex Quick Reference Guide
• Regex One-Liners

Regex Example

Practice

For practice, try our Regex Challenge.

Remember, regular expressions can be complex, but with practice, you'll become a regex wizard in no time!