# Filter Engine

A Filter engine filters a track to return only records that meet specified conditions. This section describes the parameters that you can set in the configuration section for a Filter ESP task.

Configuration Parameter | Description
--- | ---
Input | The track to filter.
LuaScript | A Lua script that defines conditions that a record must meet in order to be included in the output track.
RequiredString | A string that a record must contain in order to be included in the output track.
RequiredSubstring | A substring that a record must contain in order to be included in the output track.
Type | The type of ESP engine to use. Set this parameter to `filter`.

## Output Tracks

This engine produces a single output track, named `TaskName.Output`. The output track has the same format as the input track.

© Copyright 2019 Micro Focus or one of its affiliates | Send documentation feedback Close Send documentation feedback To open the configured email client on this computer, open an email window. Otherwise, copy the information below to a mail client, and then send this email to swpdl.idoldocsfeedback@microfocus.com. We appreciate your feedback! Product: Topic Title: Help Topic: Feedback:

_FT_HTML5_bannerTitle.htm