JavaScript RegExp \w Metacharacter

The RegExp \w Metacharacter in JavaScript is used to find the word character i.e. characters from a to z, A to Z, 0 to 9. It is the same as [a-zA-Z_0-9]. 

Syntax: 

/\w/ 

or

new RegExp("\\w")

Syntax with modifiers:

/\w/g 

or

new RegExp("\\w", "g")

Example 1: This example searches the lowercase characters, uppercase characters and underscore. 

html

<h1 style="color:green">
    GeeksforGeeks
</h1>

<h2>RegExp \w Metacharacter</h2>

<p>Input String: GeeksforGeeks@_123_$</p>

<button onclick="geek()">
    Click it!
</button>

<p id="app"></p>

<script>
    function geek() {
        var str1 = "GeeksforGeeks@_123_$";
        var regex4 = /\w/g;
        var match4 = str1.match(regex4);

        document.getElementById("app").innerHTML =
                    "Found " + match4.length
                    + " matches: " + match4;
    }
</script>

Output:

JavaScript RegExp \w Metacharacter

Example 2: This example searches the lowercase characters, uppercase characters and underscores and replaces them with hash(#). 

html

<h1 style="color:green">
    GeeksforGeeks
</h1>

<h2>RegExp \w Metacharacter</h2>

<p>Input String: 128@$%</p>

<button onclick="geek()">
    Click it!
</button>

<p id="app"></p>

<script>
    function geek() {
        var str1 = "128@$%";
        var replacement = "#";
        var regex4 = new RegExp("\\w", "g");
        var match4 = str1.replace(regex4, replacement);

        document.getElementById("app").innerHTML =
                "Found " + match4.length
                + " matches: " + match4;
    }
</script>

Output:

JavaScript RegExp \w Metacharacter

Supported Browsers: The browsers supported by RegExp \w Metacharacter are listed below:

• Google Chrome
• Apple Safari
• Mozilla Firefox
• Opera
• Internet Explorer

We have a complete list of Javascript RegExp expressions, to check those please go through this JavaScript RegExp Complete Reference article.

We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.