Regular expressions (or regex) are a powerful tool for pattern matching in JavaScript. They allow you to search through strings and identify patterns that match a certain structure, which can be very useful for tasks such as data validation and text processing.
Syntax:
To use regex in JavaScript, you need to create a RegExp object, which has a pattern (the text you want to search for) and optional flags for case-insensitivity, global and multi-line searches.
You can create a RegExp object using the constructor function:
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Or using a literal notation:
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Flags:
Methods:
JavaScript provides two methods for working with regular expressions:
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Example:
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In this example, the regular expression matches one or more digits (represented by '\d+'), and the 'g' flag specifies a global search that should find all matches in the string. The match() method then returns an array containing all the matches that were found.
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