I seem to have the same issue as this person: https://answers.atlassian.com/questions/47338 (I'm using the advanced search however, and I'm planning the URL encode the JQL to use the REST API)
I am trying to find specific issues which the summary begins with "[QC TASK]".
I tried the following, which works, but also finds other issues I don't want, like one having the summary "have the QC tasks displayed"
summary~"QC TASK" and status="in progress"
This returns the exact same thing:
summary~"\\[QC TASK\\]" and status="in progress"
And if I don't escape the '[', it results a lot of things that I don't want.
How do I make this work properly? Another solution would be to use an operator "starts with" instead of "contains", does that exist? Or maybe even make the search case sensitive.