Question

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

Answer 1

fun main() {
    var s = "771-290-1652"
    if (isValidFormat(s)) {
        println("Valid")
    } else {
        println("Not Valid")
    }

    s = "771-29-162"
    if (isValidFormat(s)) {
        println("Not Valid")
    } else {
        println("Not Valid")
    }

    s = "771-ZZ1-1620"
    if (isValidFormat(s)) {
        println("Not Valid")
    } else {
        println("Not Valid")
    }
}

fun isValidFormat(s: String): Boolean {
    val pattern = "(\\d{3}-)?\\d{3}-\\d{4}"
    
    return s.matches(pattern.toRegex())
}

 
 
/*
run:
   
Valid
Not Valid
Not Valid
   
*/

 

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