JavaScript RegExp [abc] Expression

The RegExp [abc] Expression in JavaScript is used to search any character between the brackets. The character inside the brackets can be a single character or a span of characters.

• [A-Z]: It is used to match any character from uppercase A to Z.
• [a-z]: It is used to match any character from lowercase a to z.
• [A-z]: It is used to match any character from uppercase A to lowercase z.
• [abc…]: It is used to match any character between the brackets.

Syntax:

/[abc]/ 

or

new RegExp("[abc]")

Syntax with modifiers:

/\[abc]/g 

or

new RegExp("[abc]", "g")

Example 1: This example searches the characters between [A-G] i.e uppercase A to uppercase G in the whole string. 

html

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

<h2>RegExp [abc] Expression</h2>

<p>
    GEEKSFORGEEKS is the computer
    science portal for geeks.
</p>

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

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

<script>
    function geek() {
        var str1 = "GEEKSFORGEEKS is the computer"
                    + " science portal for geeks.";
        var regex4 = /[A-G]/g;
        var match4 = str1.match(regex4);

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

Output:

JavaScript RegExp [abc] Expression

Example 2: This example searches the characters between [a-g] i.e lowercase a to lowercase g in the whole string. 

html

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

<h2>RegExp [abc] Expression</h2>

<p>
    GEEKSFORGEEKS is the computer
    science portal for geeks.
</p>

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

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

<script>
    function geek() {
        var str1 = "GEEKSFORGEEKS is the computer"
                + " science portal for geeks.";
        var regex4 = /[a-g]/g;
        var match4 = str1.match(regex4);

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

Output:

JavaScript RegExp [abc] Expression

Supported Browsers: The browsers supported by RegExp [abc] Expression 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.