js check if string contains uppercase code example

Example 1: check if letter is uppercase javascript

const isUpperCase = (string) => /^[A-Z]*$/.test(string)

Example 2: regex for lowercase letters js

function hasLowerCase(str) {
    return (/[a-z]/.test(str));
}

Example 3: how to check string uppercase or lowersace using regex javascript

var regex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!#\*\?])(?=.{8,})/;

Example 4: check if letter is uppercase javascript

isUpperCase('A') // true
isUpperCase('a') // false

Example 5: how to check if the first letter of a string is capitalized or uppercase in js

/**** Check if First Letter Is Upper Case in JavaScript***/
function startsWithCapital(word){
    return word.charAt(0) === word.charAt(0).toUpperCase()
}

console.log(startsWithCapital("Hello")) // true
console.log(startsWithCapital("hello")) // false