JavaScript | RegExp uxxxx Metacharacter (original) (raw)

Last Updated : 23 Apr, 2019

The RegExp \uxxxx Metacharacter in JavaScript is used to find the unicode character specified by a hexadecimal number xxxx. If match is found it returns the word else it returns NULL.Syntax:

/\uxxxx/

or

new RegExp("\uxxxx")

Syntax with modifiers:

/\uxxxx/g

or

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

Example 1: This example matches the word corresponding to hexadecimal number 0047 i.e G in the whole string.

html `

JavaScript RegExp \uxxxx Metacharacter 
<h1 style="color:green">
    GeeksforGeeks
</h1>

<h2>RegExp \uxxxx 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 = /\u0047/gi;
        var match4 = str1.match(regex4);

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

`

Output: Before Clicking the button: hexax After Clicking the button: hexax Example 2: This example matches the hexadecimal number (0067) which corresponds to "g" and replaces it with "G".

html `

JavaScript RegExp \uxxxx Metacharacter 
<h1 style="color:green">
    GeeksforGeeks
</h1>

<h2>RegExp \uxxxx Metacharacter</h2>

<p>String: geeky@128</p>

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

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

<script>
    function geek() {
        var str1 = "geeky@128";
        var regex4 = new RegExp("\\u0067", "gi");         
        var replace = "G";
        var match4 = str1.replace(regex4, replace);
        document.getElementById("app").innerHTML = 
                " New string: " + match4;
    }
</script>

`

Output: Before Clicking the button: hexax After Clicking the button: hexax Supported Browsers: The browsers supported by RegExp \uxxxx Metacharacter are listed below: