regex stands for "regular expressions". They are used to define a string search pattern that could be used in some web applications like Google editors to do input validation, search and replace among other similar tasks.

A regular expression (abbreviated regex or regexp and sometimes called a rational expression) is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations.

Source: https://en.wikipedia.org/wiki/Regular_expression

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