moving from Yavsc main lib

Yavsc.Server/Attributes/Validation/YaRegularExpression.cs

@@ -0,0 +1,16 @@
+using System.Resources;
+
+namespace Yavsc.Attributes.Validation
+{
+    public class YaRegularExpression : System.ComponentModel.DataAnnotations.RegularExpressionAttribute { 
+        public YaRegularExpression(string pattern): base (pattern)
+        {
+            this.ErrorMessage = pattern;
+        }
+
+        public override string FormatErrorMessage(string name)
+        {
+            return ResourcesHelpers.GlobalLocalizer[this.ErrorMessageResourceName];
+        }
+    }
+}