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Programming Concepts Intermediate

What is Regex (Regular Expression)?

A sequence of characters that defines a search pattern, used for string matching, validation, and text manipulation.

Regular expressions are powerful pattern-matching tools. Common syntax includes . (any character), * (zero or more), + (one or more), ? (optional), [] (character class), ^ (start), $ (end), and () (grouping).

Uses include email validation, log parsing, search-and-replace, and data extraction. While powerful, complex regex can be hard to read. Tools like regex101.com help build and test patterns. Every major programming language supports regex.

Related Terms

Hash Table
A data structure that maps keys to values using a hash function, providing average O(1) time complexity for lookups, insertions, and deletions.
DRY (Don't Repeat Yourself)
A software development principle that aims to reduce code duplication by abstracting common patterns into reusable components.
Immutable Object
An object whose state cannot be modified after creation, providing thread safety and predictable behavior in concurrent systems.
Linked List
A linear data structure where elements are stored in nodes, each containing data and a pointer to the next node in the sequence.
Closure
A function that captures and retains access to variables from its enclosing scope, even after that scope has finished executing.
Factory Pattern
A creational design pattern that provides an interface for creating objects without specifying their exact classes.
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