Regular Expressions
Regular expressions (regex) are a sequence of characters that define a search pattern, used for string matching, validation, and text manipulation. They provide a concise and flexible means to match, search, and replace text based on specific patterns, supported by most programming languages and tools. Regex patterns can range from simple literal matches to complex expressions involving quantifiers, character classes, and groups.
Developers should learn regex for tasks like data validation (e.g., email or phone number formats), text parsing (e.g., extracting data from logs or documents), and search-and-replace operations in code or files. It is essential in scenarios involving input sanitization, web scraping, and natural language processing, where pattern-based text handling is required.