Question

How to check if a string contains only English letters in JavaScript

Answer 1

function isOnlyEnglishLetters(s) {
    const pattern = /^[a-zA-Z]+$/;
    
    return pattern.test(s);
}

const s1 = "JavaScript";
console.log(isOnlyEnglishLetters(s1));

const s2 = "JavaScriptプログラミング";
console.log(isOnlyEnglishLetters(s2));



/*
run:

true
false

*/

 

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