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JavaScript Regular Expressions

Regular expression arguments (instead of string arguments) can be used in the methods above.Regular expressions can make your search much more powerful (case insensitive for example).
JavaScript Regular Expressions

A regular expression is a sequence of characters that forms a search pattern.The search pattern can be used for text search and text replace operations.

A regular expression is a sequence of characters that forms a search pattern. When you search for data in a text, you can use this search pattern to describe what you are searching for.A regular expression can be a single character, or a more complicated pattern.Regular expressions can be used to perform all types of text search and text replace operations.

There are two methods for the string:

The search() method searches a string for a specified value and returns the position of the match.

The test() method searches a string for a pattern, and returns true or false, depending on the result.

JavaScript RegExp Object
https://www.w3schools.com/js/js_regexp.asp

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