Answers for "javascript check if capital letter"

javascript check if all capital letter

function isUpper(str) {
    return !/[a-z]/.test(str) && /[A-Z]/.test(str);
}

isUpper("FOO"); //true
isUpper("bar"); //false
isUpper("123"); //false
isUpper("123a"); //false
isUpper("123A"); //true
isUpper("A123"); //true
isUpper(""); //false

check if letter is uppercase javascript

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

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

how to check string uppercase or lowersace using regex javascript

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

check if letter is uppercase javascript

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

check if letter is uppercase javascript

var strings = 'this iS a TeSt 523 Now!';
var i=0;
var character='';
while (i <= strings.length){
    character = strings.charAt(i);
    if (!isNaN(character * 1)){
        alert('character is numeric');
    }else{
        if (character == character.toUpperCase()) {
            alert ('upper case true');
        }
        if (character == character.toLowerCase()){
            alert ('lower case true');
        }
    }
    i++;
}