If you attempt to search JIRA issues for special characters (in text fields), using properly escaped special character syntax (see our documentation on Escaping Special Characters when performing text searches for details), no results are retrieved, even when JIRA issues containing these characters (in the relevant text fields) actually do exist.
It seems this problem is a bug (and that this functionality should exist in JIRA) because when you attempt to perform a Simple or Quick search like:
and you switch to Advanced search, this search term gets resolved to the properly escaped JQL syntax:
Further to this it's been found that not only escaping [ does not work, but other characters don't escape correctly.
We tested the following special characters in our documentation only to find that most of them do not work:
Doing special character searches have the following problems with escaping: