String Handling and Regular Expressions

This lesson covers string handling — the manipulation and processing of text data — and regular expressions — powerful pattern-matching tools used for searching, validating, and transforming strings. These are essential skills for A-Level Computer Science.

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String Basics

A string is a sequence of characters. In most programming languages, strings are immutable — once created, they cannot be changed in place. Any operation that appears to modify a string actually creates a new string.

Common String Operations