The replace() method searches a string for a specified value, or a regular expression, and returns a new string where the specified values are replaced.
<body>
<p>Click the button to replace "blue" with "red" in the paragraph below:</p>
<p id="demo">Mr Blue has a blue house and a blue car.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var str = document.getElementById("demo").innerHTML;
var res = str.replace(/blue/g, "red");
document.getElementById("demo").innerHTML = res;
}
</script>
</body>
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