JavaScript .replace()

Searches a string for a string value, or a regular expression, and returns a new string where some or all matches are replaced.

Syntax

string.replace(searchValue, replacementValue);

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If the searchValue is a string then only the first instance of the value will be replaced. To replace all instances, use the global (g) modifier on a regular expression.

Example

Replace 'cats' with 'rats':

const weather = `It's raining cats and dogs!`;

const replaceCatsWithRats = weather.replace('cats', 'rats');

console.log(replaceCatsWithRats);
// Output: It's raining rats and dogs!

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Codebyte Example

The following is runnable and demonstrates the .replace() method using regular expressions (RegExp):

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