JavaScript – Replace a Substring in String
To replace the occurrence(s) of a substring in a string with a new value in JavaScript, call replace() method on this string, and pass the search string and replacement string as arguments.
Syntax
The syntax to replace a substring searchValue with a new value replaceValue in this string str is
str.replace(searchValue, replaceValue)
replace() method returns a new string with the replacement(s) done, and keeps the original string str unchanged.
Examples
Replace the First Occurrence
In the following example, we take three strings: str, searchValue, and replaceValue. We will use replace() method to replace the first occurrence of searchValue with replaceValue in str.
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Replace All Occurrences using Global Modifier
In the following example, we take a string str and replace ‘apple’ with ‘mango’ at all the occurrences using global(g) modifier.
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Conclusion
In this JavaScript Tutorial, we learned how to replace a substring with a new value in this string in JavaScript, using replace() method, with examples.