['trandate', 'notbefore', 'daysAgo17']
Here are the search operators:
https://system.netsuite.com/app/help/helpcenter.nl?fid=section_N3005172.html
Of course you can use serach.Operator enum:
https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4345782273.html
Here are the search summary types:
https://system.netsuite.com/app/help/helpcenter.nl?fid=section_N3010474.html
You can use ANYOF operator only on select type fields (List/Record). If you want to use it against free-text fields (like names, emails etc.), the only way is to create a nested Filter Expression with 'OR' operators:
[ ['email', 'startswith', '[email protected]'],
  'or', ['email', 'startswith', '[email protected]'], 
  'or', ['email', 'startswith', '[email protected]'], 
  'or', ['email', 'startswith', '[email protected]'] 
]
or you can write small script, doing this instead of you:
function stringFieldAnyOf(fieldId, listOfValues) {    
    var result = [];
    if (listOfValues.length > 0) {
        for (var i = 0; i < listOfValues.length; i++) {
            result.push([fieldId, 'startswith', listOfValues[i]]);
            result.push('or');
        }
        result.pop(); // remove the last 'or'
    }
    return result;
}
// usage: (two more filters added just to illustrate how to combine with other filters)
var custSearch = search.create({
  type: record.Type.CUSTOMER,
  columns: searchColumn,
  filters: [
            ['companyname', 'startswith', 'A'], 
            'and', stringFieldAnyOf('email', ['[email protected]', '[email protected]']),
            'and', ['companyname', 'contains', 'b']
           ]
});
    var s = search.load('customsearch1234');
    
    log.debug('filterExpression', JSON.stringify(s.filterExpression));