Regular Expressions: The Guide I Always Wanted (2026) Regex isn't magic. It's a mini-language for pattern matching, and once you learn the basics, you'll use it everywhere. The Mental Model A regex is a pattern that matches (or doesn't match) text. Think of it as: "Find all strings that look like THIS" Components: → Literals: exact characters to match (a, b, 1, @) → Character classes: WHAT can match ([a-z], \d, \w) → Quantifiers: HOW MANY times (+, *, ?, {3}) → Anchors: WHERE in the string (^, $, \b) → Groups: capture parts of the match ((...)) → Alternation: OR logic (|) The secret to reading regex: left to right, character by character. Enter fullscreen mode Exit fullscreen mode Character Classes // Exact match / hello / // Matches "hello" in "say hello there" /Hello/ // Case sensitive! Won't match "hello" // Dot (matches any single character EXCEPT newline) / h . t / // "hat", "hot", "hit", "h3t"...…