Question

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

Answer 1

function isValidFormat(s: string) {
    const pattern: RegExp = /^(\d{3}-)?\d{3}-\d{4}$/;
    
    return pattern.test(s);
}

let s: string = "901-173-9038";
if (isValidFormat(s)) {
    console.log("Valid");
} else {
    console.log("Not Valid");
}
    
s = "900-54-167";
if (isValidFormat(s)) {
    console.log("Valid");
} else {
    console.log("Not Valid");
}

s = "882-VX9-4620";
if (isValidFormat(s)) {
    console.log("Valid");
} else {
    console.log("Not Valid");
}

     
     
/*
run:
     
"Valid" 
"Not Valid" 
"Not Valid" 
     
*/

 

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