I don't think you're going to be able to search for a slash. This page doesn't include the slash as one of the special characters. I believe the standard Lucene indexer, which that page says JIRA uses, splits words based on punctuation. It treats the slash as punctuation and not searchable.
I've looked at both pages:
https://confluence.atlassian.com/jirasoftwarecloud/advanced-searching-764478330.html "Advanced searching"
https://confluence.atlassian.com/jirasoftwarecloud/search-syntax-for-text-fields-764478343.html "Search syntax for text fields"
Q: How are you escaping it?
A: Any way I can try I think I've tried all combinations of single/double quote, single/double backslash, Unicode escape notation, etc.
I think you're right. While the slash is listed as a Reserved Character on the "Advanced searching" page, it is not listed as a Special Character on the "Search syntax for text fields" page. Your reference
https://confluence.atlassian.com/jira/performing-text-searches-185729616.html "Performing Text Searches"
http://lucene.apache.org/core/3_3_0/queryparsersyntax.html "Apache Lucene - Query Parser Syntax"
which, like the JIRA doc, lists the same reserved characters (which doesn't include slash).
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