DevCurry: JavaScript: Filter Bad Words in a String

In this post, we will see how to filter bad words in a string using JavaScript. To do so, we will first define an array that contains all the words that are to be filtered. We will then use a regular expression to check a piece of text (bad words) in a string.

Let us see some code:

<head>
    <title>JavaScript BadWord Filter by DevCurry.com</title>
    <script type="text/javascript">
        var filterWords = ["fool", "dumb", "couch potato"];
        // "i" is to ignore case and "g" for global
        var rgx = new RegExp(filterWords.join(""), "gi");

        function wordFilter(str) {          
                return str.replace(rgx, "****");           
        }

        // call the function
        document.write("Original String - ");
        document.writeln("You fool. Why are you so dumb  <br/>");   
        document.write("Replaced String - ");
        document.writeln(wordFilter("You fool. Why are you so dumb"));   
    </script>
</head>

As you can see, the filterWords array contains some bad words we want to filter. We then use a Regex to match the pattern, as shown below.

The first parameter is a string with the pattern and the second patterns is to make the match case-insensitive and global (match more than one words)

The function wordFilter then uses this Regex to replace the abusive word with *****

That’s it. Call this function on a string and this is what you get.

OUTPUT

See a Live Demo

JavaScript: Filter Bad Words in a String

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