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public static bool RegexValidate(string validateString) 
{
Regex regex = new Regex("^[0-9]+(.[0-9]{0,2})?$"); //驗證有兩位小數的正實數：^[0-9]+(.[0-9]{2})?$ //驗證有1-3位小數的正實數：^[0-9]+(.[0-9]{1,3})?$ return regex.IsMatch(validateString.Trim()); 
}