Unable to Escape Characters in Query

If a value to query for in an exact match query contains a special character (e.g. a bracket), the query parser is unable to parse the input string successfully. The problem is that the user has to have the option to escape characters that have to be taken verbatim. The parser cannot, without any help, examine the input string and detect which spacial characters are taken as is and which have special meaning.

We therefore need the feature of escaping characters.

For instance: To find a document with an exact match containing brackets, the query looks like this:

$<Identifier>=[My Term (with brackets)]