How do I validate a Numeric character in scala? [duplicate]

Question

my application takes in a string like this (-110,23,-111.9543633) I need to validate/retrieve inside scala script that the string whether it is Numeric or not?

Answer 1

Consider scala.util.Try for catching possible exceptions in converting a string onto a numerical value, as follows,

Try("123".toDouble).isSuccess
Boolean = true

Try("a123".toDouble).isSuccess
Boolean = false

As of ease of use, consider this implicit,

implicit class OpsNum(val str: String) extends AnyVal {
  def isNumeric() = scala.util.Try(str.toDouble).isSuccess
}

Hence

"-123.7".isNumeric
Boolean = true

"-123e7".isNumeric
Boolean = true

"--123e7".isNumeric
Boolean = false