Hi,
The above expression is same as TrimEnd. If you need to delete all quote, the following works.
System.Text.RegularExpressions.Regex.Replace(yourString,"[\u0022\u0094]","")
This expression removes character 0x22 and 0x94. If your string contains other double quote character, please add its code. Or can you share your string as a file using WriteTextFile activity? Because, in this forum, some characters are automatically converted to other.
Regards,