Memeriksa apakah karakter adalah alfabet di JS
function isLetter(str) {
return str.length === 1 && str.match(/[a-z]/i);
}
Bored Buzzard
function isLetter(str) {
return str.length === 1 && str.match(/[a-z]/i);
}function isAlphaOrParen(str) {
return /^[a-zA-Z()]+$/.test(str);
}
/*/^[a-zA-Z()]*$/ - also returns true for an empty string
/^[a-zA-Z()]$/ - only returns true for single characters.
/^[a-zA-Z() ]+$/ - also allows spaces*/
//better regEX to include question marks toofunction isAlphaOrParen(str) {
return /^[a-zA-Z()]+$/.test(str);
}