Using capital NOT inside a string on a JQL will cause Jira to not match any issues to the search

Summary

If capital NOT is used inside a string when searching for issues, Jira will fail to match any issues to this search.

Steps to Reproduce

1. Create an issue that contains the word not in the summary.
2. Go into the issue navigator and search this issue with the following JQL:

   summary ~ "this is NOT a summary"
   

Expected Results

Issues that match the query will be returned on this search.

Actual Results

No issues are returned from this query.

Workaround

Adjusting the JQL and replacing NOT with not will ensure that the query works as expected.