Mastering Regular Expressions: A Practical Guide for Developers

# Mastering Regular Expressions: A Practical Guide for Developers Regular expressions (Regex) are powerful sequence matchers used for text search, validation, and string transformation across all major programming languages. ## Key Regex Flags - `g` (Global): Find all matches rather than stopping after the first match. - `i` (Case Insensitive): Match text regardless of uppercase or lowercase letters. - `m` (Multiline): Change `^` and `$` to match the beginning and end of each line. ## Common Validation Patterns - **Email Regex**: `/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/` - **Slug Validation**: `/^[a-z0-9]+(?:-[a-z0-9]+)*$/`