A value is the optional value of the tag. The string value can be from 1 to 256 Unicode characters in length and cannot be prefixed with
"aws:" or "rds:". The string may only contain only the set of Unicode letters, digits, white-space, '_', '.', '/', '=', '+', '-' (Java
regex: "^([\\p{L}\\p{Z}\\p{N}_.:/=+\\-]*)$").

C# |
public string Value { get; set; }