Check Uppercase Javascript Code Example

Example 1: uppercase javascript

var str = "Hello World!"; var res = str.toUpperCase();  //HELLO WORLD!

Example 2: 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

Example 3: javascript uppercase string

var str = "Hello World!"; var res = str.toUpperCase();

Example 4: how to check string uppercase or lowersace using regex javascript

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

Example 5: how to find if given character in a string is uppercase or lowercase in javascript

var str = S;    if (str == str.toUpperCase())   {     console.log(" Uppercase");   }   else   {     console.log("Lowercase");   }