When using the filter setting in data-options or the REST API, the key is “filter” and then the value is a bar-separated set of your filter settings. This normally takes the form {field}|{operator}|{value}, like, title|matches|Welcome or gid|equals|7.

Supported operators for the filter setting include:

• equals
• not_equals
• contains
• matches
• not_matches
• before
• after
• less_than
• greater_than
• range
• has
• not_having
• regexp
• not_regexp

and have the same meanings as the associated XPHP Conditional operations.

Note: When using has or not_having to check for the existence or absence of a field via data-options or the REST API, you don’t need to supply a value, but you do still need two separate | to meet the required syntax. This means /filter/profiles_17|has| is the proper syntax for “return results where profiles_17 has some value.”