Try this
(?<=Cannot\s*add\s*user\.\s*‘)(\w+)
Or
(?<=Cannot\s*add\s*user.*)([A-Z]+)
System.Text.RegularExpressions.Regex.Match(Input,"(?<=Cannot\s*add\s*user.*)([A-Z]+)").Value
Regards,
Try this
(?<=Cannot\s*add\s*user\.\s*‘)(\w+)
Or
(?<=Cannot\s*add\s*user.*)([A-Z]+)
System.Text.RegularExpressions.Regex.Match(Input,"(?<=Cannot\s*add\s*user.*)([A-Z]+)").Value
Regards,