Question

How to check whether the string contain only letters and numbers in JavaScript

Answer 1

var s = "javascript123";

if (/^[a-zA-Z0-9]*$/.test(s) === false) {
    document.write("false");
} else {
    document.write("true");
}


/*
run:
  
true 
     
*/

 

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Answer 2

var s = "javascript - 123";

if (/^[a-zA-Z0-9]*$/.test(s) === false) {
    document.write("false");
} else {
    document.write("true");
}


/*
run:
  
false 
     
*/

 

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