"Escaping special characters" section in Performing Text Searches says:

For example, to search for (1+1) in either a simple or quick search, use the query:

\(1\+1\)

and to search for [example] in the summary of an advanced search (in JIRA Query Language or JQL), use the query:

summary ~ "\\[example\\]"

It is not good as an example because the above description may mislead us that those queries can match only with the exact texts but actually the 1st query matches not only with the exact text but also with 1+1, <1+1>, [1+1], etc. Similarly, the 2nd query matches not only with the exact text but also with <example>, (example), example, etc (See attached files).

It may be better to choose another query as the example.