TCL set Special Characters in a string

Question

I want to set in TCL the below error message as a variable and compare with the error message from a network switch, by-passing the special characters

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Answer 1

Well, you can use wrap it in curly brackets as follows:

set x {Use [slot/port] or ["portname"] or [slot/] or [].}

Alternatively, you can escape special characters with backslash.