Rally - API: What are the considerations for special characters?

Document ID : KB000117801
Last Modified Date : 21/03/2019
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Are there any special considerations that need to be given when using upper ASCII characters such as backslashes and parenthesis?
The following common upper ASCII characters can be used without any special consideration:

The following characters need special consideration when used with the "contains" operator as they are considered wild cards:
%t%g will pull "tag" and "telecommuting"
_t_g will pull "tag" and "tug"

The following characters need to be URL encoded:

The following characters need to be escaped with a \: