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(""); //falsejs test letter lowercase
if (character == character.toLowerCase())
{
// The character is lowercase
}
else
{
// The character is uppercase
}
//The problem with this answer is,
//that some characters like numbers or punctuation
//also return true when checked for lowercase/uppercase.
// this is the solution for it:
function isLowerCase(str)
{
return str == str.toLowerCase() && str != str.toUpperCase();
}how to check string uppercase or lowersace using regex javascript
var regex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[!#\*\?])(?=.{8,})/;check if string contains lowercase javascript
// A minified version of the other one:
const hasLowerCase= s => s.toUpperCase() != s;
console.log("HeLLO: ", hasLowerCase("HeLLO"));
console.log("HELLO: ", hasLowerCase("HELLO"));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");
}Copyright © 2021 Codeinu
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