Web Reference: Mar 17, 2026 · This chapter describes JavaScript regular expressions. It provides a brief overview of each syntax element. For a detailed explanation of each one's semantics, read the regular expressions reference. Regular Expressions A Regular Expression is a sequence of characters that forms a search pattern. Regex is a common shorthand for a regular expression. JavaScript RegExp is an Object for handling Regular Expressions. RegExp are be used for: Text searching Text replacing Text validation Regular expressions are useful because they allow us to describe more complicated patterns. Say we want to match any number. In a regular expression, putting a set of characters between square brackets makes that part of the expression match any of the characters between the brackets.
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