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A regular expression (regex) is a sequence of characters that defines a specific search pattern. When included in code or search algorithms, regular expressions can be used to find certain patterns of characters within a string, or to find and replace a character or sequence of characters within a string.
In this tutorial, we will analyze the following regular expression to search for email addresses within a document or verify that a user's email address input is a valid email address:
/^([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$/
Each component of this regex has a unique responsibility to make sure that a user enters an email address that begins with an unspecified number of characters preceding the @ symbol, followed by a domain.