QA Checker "Grouped search expression - report if source matches but not target"

In the documentation regarding QA Checker "Grouped search expression - report if source matches but not target," there is a note stating the following:

Note: The target RegEx cannot contain any special escape characters and will act exactly as pattern for replace function of .NET RegEx implementation.

Could someone tell me where "pattern for replace function of .NET RegEx implementation" is specifically documented?

I see that the documentation has examples such as

source - (\b\d+\b)
target - \b$1\b

which seems to imply that "\b" is accepted. What other escapes can be used?

Thanks in advance.

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