Web Reference: Jul 22, 2025 · The replaceAll () method of String values returns a new string with all matches of a pattern replaced by a replacement. The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match. The original string is left unchanged. Description The replaceAll() method searches a string for a value or a regular expression. The replaceAll() method returns a new string with all values replaced. The replaceAll() method does not change the original string. The replaceAll() method was introduced in JavaScript 2021. If searchValue is a string, String.prototype.replace only replaces a single occurrence of the searchValue, whereas String.prototype.replaceAll replaces all occurrences of the searchValue (as if .split(searchValue).join(replaceValue) or a global & properly-escaped regular expression had been used).
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