Regular expression - Hex check

Hexadecimal number verification using Regular Expression

Find if the string is a Hex number

Info

To Check if a string is a number in Hex format, the following checks are made. It may contain only the following characters

• It can start with 0x or not
• is a numerical digit from 0 to 9
• is a string character from a to f
• is a string character from A to F

Sample Code

function isHex(str) {
    // Regex to match one or more hex characters from start (^) to end ($) of the string
    const regexp = /^(0x)?[0-9a-fA-F]+$/;
    return regexp.test(str);
}

isHex('0x1f003');   // output: true
isHex('1fzzz');     // output: false