grokify/mogo

package stringsutil

import (
    "regexp"
)

func DigitsOnly(input string) string {
    return rxNonNumeric.ReplaceAllString(input, "")
}

var (
    rxAlpha        = regexp.MustCompile(`^[A-Za-z]+$`)
    rxAlphaNumeric = regexp.MustCompile(`^[0-9A-Za-z]+$`)
    rxNumeric      = regexp.MustCompile(`^[0-9]+$`)
    rxNonNumeric   = regexp.MustCompile(`[^0-9]`)
)

func IsAlpha(s string) bool {
    return rxAlpha.MatchString(s)
}

func IsAlphaNumeric(s string) bool {
    return rxAlphaNumeric.MatchString(s)
}

func IsNumeric(s string) bool {
    return rxNumeric.MatchString(s)
}