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## Introduction
In @sec-strings, you learned a whole bunch of useful functions for working with strings.
In this this chapter we'll learn even more focusing on functions that use **regular expressions**, are a concise and powerful language for describing patterns within strings.
In this chapter we'll learn even more focusing on functions that use **regular expressions**, are a concise and powerful language for describing patterns within strings.
The term "regular expression" is a bit of a mouthful, so most people abbreviate to "regex"[^regexps-1] or "regexp".
[^regexps-1]: You can pronounce with either a hard-g (reg-x) or a soft-g (rej-x).