Regex, or Regular Expressions, is a powerful tool for pattern matching and text manipulation. 📌

What is Regex?

Regex allows you to search, replace, and validate text using patterns. It's widely used in programming, data analysis, and automation.

regular_expression

Core Syntax & Concepts

  • Literals: Match exact characters (e.g., a matches the letter "a")
  • Metacharacters: Special symbols like . (any character), * (zero or more), + (one or more)
  • Character Classes: Define a set of characters (e.g., [aeiou] matches any vowel)
  • Anchors: ^ (start of string), $ (end of string)
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Practical Examples

  1. Matching emails: \b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b
  2. Extracting numbers: \d+
  3. Replacing spaces: s/ /_/g (in Perl-style syntax)

Need more examples? Check out our Regex Examples guide!

Expand Your Knowledge

For advanced topics like lookaheads or regex in different programming languages:

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Stay curious! 🌟