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JavaScript to Replace All Occurrences of a Substring Within a String

You have a string with multiple occurrences of a substring within and you want to replace every occurrence of that substring with a different substring. Two built-in string methods make this operation extremely easy.

string.split(substring)

The .split method splits a string into pieces at a substring that you specify and returns the substrings as an array.

array.join(separator)

The .join method joins all elements of an array separating each element of the array with a substring that you specify, and returns a single string.

string.split(substring).join(replacement)

You can combine the call to the .split method and .join method to perform the operation in a single statement.

<html>
<head>

<script>
document.write("Original String:<br /><br />");
var strOriginal = "The blooming, bloody spider went up the spider web. The blooming, bloody rain came down and washed the spider out. The blooming, bloody sun came out and dried up all the rain. And the blooming, bloody spider came up the web again.";
document.write(strOriginal);

document.write("<br /><br />Modified String:<br /><br />");
var strModified = strOriginal.split("blooming, bloody").join("itsy bitsy");
document.write(strModified);

</script>

</head>
<body>

</body>
</html>

The example code above takes the string "The blooming, bloody spider went up the spider web. The blooming, bloody rain came down and washed the spider out. The blooming, bloody sun came out and dried up all the rain. And the blooming, bloody spider came up the web again." and replaces the substrings "blooming, bloody" within it with "itsy bitsy".

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