regex only allow numbers code example
Example 1: just number regex
// https://regex101.com/r/qyq3PG/1
// or
/^[0-9]*$/
Example 2: regex 10 numbers only
@"^\d{10}$"
// https://regex101.com/r/qyq3PG/1
// or
/^[0-9]*$/
@"^\d{10}$"