Question

How to check if a string contain only letters and (or) digits in JavaScript

Answer 1

function is_letters_and_or_digits(s) { 
    var letters_digits = /^[0-9a-zA-Z]+$/;
    if (s.match(letters_digits)) { 
        return true;
    }
    else { 
        return false;
    }
} 
   
var s = "3.14";
document.write(is_letters_and_or_digits(s) + "<br />");

var s = "847";
document.write(is_letters_and_or_digits(s) + "<br />");

var s = "f35";
document.write(is_letters_and_or_digits(s) + "<br />");

var s = "abc 123";
document.write(is_letters_and_or_digits(s) + "<br />");

var s = "javascript";
document.write(is_letters_and_or_digits(s) + "<br />");


     
/*
run:
 
false
true
true
false
true
          
*/

 

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