using System.ComponentModel.DataAnnotations; using System.Numerics; using System.Text; using System.Text.RegularExpressions; namespace NejCommon.Validation; public class IdentifierTextAttribute : RegexAttribute{ public IdentifierTextAttribute() : base(@"\A[A-Za-z0-9][A-Za-z0-9._/-]*\z","Aa_bb-12.3"){ } }