func HasLowerCase(str string) bool {
	return regexp.MustCompile(PatternHasLowerCase).MatchString(str)
}
HasLowerCase check if the string contains at least 1 lowercase.
package vvalidator
import (
	"regexp"
)
const (
	PatternHasLowerCase = ".*[[:lower:]]"
	PatternHasUpperCase = ".*[[:upper:]]"
)