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How does regex work in JavaScript?

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How does regex work in JavaScript?

Asked on Aug 18, 2025

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Regular expressions (regex) in JavaScript are patterns used to match character combinations in strings. They are implemented using the RegExp object or by using regex literals.

// Example of using regex to find all occurrences of "cat" in a string
        const text = "The cat sat on the mat with another cat.";
        const regex = /cat/g;
        const matches = text.match(regex);
        console.log(matches); // Output: ["cat", "cat"]

Additional Comment:

The "g" flag in the regex indicates a global search, meaning it will find all matches in the string.
You can create regex patterns using literals (e.g., /pattern/) or the RegExp constructor (e.g., new RegExp("pattern")).
Regex can be used with methods like "match", "replace", "test", and "exec" for various string operations.

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How does regex work in JavaScript?

Asked on Aug 18, 2025

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