What is regex: A sequence of characters defining a search pattern, used for finding, replacing, or validating text across programming languages and tools. Why it matters: Regex boosts efficiency by ...

Elysse Bell is a finance and business writer for Investopedia. She writes about small business, personal finance, technology, and more. Samantha (Sam) Silberstein, CFP®, CSLP®, EA, is an experienced ...