Regular Expression, Regex for short, is a sequence of characters that is used to find patterns in strings. It's typically used by programmers to find text that matches an input pattern or replace specific text with other text. This technique is often used to clean up messy code by highlighting potential errors and warnings, as well as helping people search through large amounts of data to find what they are looking for.
Regexes are incredibly useful in certain situations, but they can also be dangerous. These sequences of characters are used to find patterns in strings of text. If you use regexes without understanding how they work, the results could lead to unintended consequences for your data.