func (f *formatifier) removeNonDigits() {
	rp := regexp.MustCompile(`\D`)
	f.theString = rp.ReplaceAllString(f.theString, "")
}
func (f *formatifier) removeNonDigits() {
	rp := regexp.MustCompile(`\D`)
	f.theString = rp.ReplaceAllString(f.theString, "")
}
func ( f * formatifier ) removeNonDigits ( ) { rp := regexp . MustCompile ( `\D` ) f . theString = rp . ReplaceAllString ( f . theString , " " ) }
// removeNonDigits removes any non digit characters from the string.
removeNonDigits removes any non digit characters from the string .