Question

How to check if a string is in a valid format ("XXX-XXX-XXXX") with numbers in Node.js

Answer 1

function isValidFormat(s) {
    const pattern = /^(\d{3}-)?\d{3}-\d{4}$/;
     
    return pattern.test(s);
}
 
let s = "491-782-8823";
if (isValidFormat(s)) {
    console.log("Valid");
} else {
    console.log("Not Valid");
}
     
s = "435-16-890";
if (isValidFormat(s)) {
    console.log("Valid");
} else {
    console.log("Not Valid");
}
 
s = "876-X54-5314";
if (isValidFormat(s)) {
    console.log("Valid");
} else {
    console.log("Not Valid");
}
 
      
      
/*
run:
      
Valid
Not Valid
Not Valid
      
*/

 

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