Search matches too much: Using special characters and = in text field such as description

SETUP
1. Create an issue with a description "foo:bar"
2. Create a second issue with a description "foo-bar"
3. Create a third issue with a description "foo=bar"

TEST
3. Do a search for the first issue with the search term "foo\:bar" (no matter if it is with or without the quote) in the text search query field.
4. Do a search for the second issue with the search term "foo-bar"
5. Do a search for the third issue with the search "term "foo=bar"

VALIDATION
6. Notice how the search terms change for the given query under Text Search Query in both 3 and 4 to "foo\ bar"
7. Notice how the search terms does NOT change in 5. The query under Text Search Query stays the same, as "foo=bar"
8. Notice how the result for 3, 4 and 5 find all 3 issues even if in the case 3 only the first issue should match, in case 4 only the second issue should match and in 5 only the third issue should match
9. Notice that the same happens for a query without escaping the special characters ":" and "-".
10. Notice that the same happens for a query when escaping the non-special character "="

I noticed this when using a customfield that uses the text search. The "=" character being the problem. It matches my delimiter I used (":") even if it should not. Also the customfield query with "\:" or "-" does NOT change to "\ " but stays the same when performing the search.

SUGGESTED FIXES
1. Do not change the given query ("\:" to "\ ")n in the text search
2. Do not match any special character and "=" with the query "\ ", "-" and "\:" (possibly also other special characters)
3. Do not match special characters with "="