MOBILE_API/Business/KftcPasswordRule/AtLeastOneLowerCaseRule.cs

using System.Text.RegularExpressions;

namespace Business.KftcPasswordRule
{
    /// <summary>
    /// </summary>
    public class AtLeastOneLowerCaseRule : PasswordRule
    {
        private string pattern = "[a-z]";

        /// <summary>
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public PasswordValidationResult Validate(ValidationModel model)
        {
            if (model == null)
            {
                return new PasswordValidationResult { IsValid = false, Message = "Invalid password.Atleast one lowercase required. " };
            }

            if (string.IsNullOrEmpty(model.Password))
            {
                return new PasswordValidationResult { IsValid = false, Message = "Invalid password.Atleast one lowercase required. " };
            }

            var res = Regex.Matches(model.Password, pattern);
            if (res.Count > 0)
            {
                return new PasswordValidationResult { IsValid = true, Message = "valid" };
            }
            return new PasswordValidationResult { IsValid = false, Message = "invalid password.Atleast one lowercase required." };
        }
    }
}