Some commands makes use of filters for varying purposes. F.ex. -f in ls and in trav. A filter is supplied as a json object (w/ or w/o the surrounding {} brackets. Both keys and values can contain regular expressions for a more flexible matching. An example of a filter could be .*url.*:http.*neo4j.*,name:Neo4j. The filter option is also accompanied by the options -i and -l which stands for ignore case (ignore casing of the characters) and loose matching (it’s considered a match even if the filter value just matches a part of the compared value, not necessarily the entire value). So for a case-insensitive, loose filter you can supply a filter with -f -i -l or -fil for short.