Option to search block dialog box parameters for the specified value, specified as the comma-separated pair consisting of 'BlockDialogParams' and a character vector or string scalar. This pair must follow the other search constraint pairs.

Option to consider case when matching, specified as the comma-separated pair consisting of 'CaseSensitive' and 'on' for case-sensitive searching or 'off'.

Option to include lines, ports, and annotations in systems in the search, specified as the comma-separated pair consisting of 'FindAll' and 'on' or 'off'.When this option is set to 'on', find_system returns a vector of handles regardless of how you specify the System argument .

Option to return only the first result and then stop the search, specified as the comma-separated pair consisting of 'FirstResultOnly' and 'on' or 'off'.

Option to look inside a referenced subsystem in a model and list child blocks specified as the comma-separated pair consisting of 'LookInsideSubsystemReference' and 'on' or 'off'.

Option to follow links into library blocks, specified as the comma-separated pair consisting of 'FollowLinks' and 'on' or 'off'. If you do not specify a system to search, find_system includes loaded libraries in the results, whether you set 'FollowLinks' to 'on' or 'off'. You can use 'FollowLinks' with 'LookUnderMasks' to update library links in subsystems. See Update Library Links in a Subsystem.

Option to include commented blocks in the search, specified as the comma-separated pair consisting of 'IncludeCommented' and 'on' or 'off'.

Option to load any partially loaded models, specified as the comma-separated pair of 'LoadFullyIfNeeded' and 'on' to load models or 'off' to disable loading. Use this option, for example, to prevent load warnings.

Options for searching under masks, specified as the comma-separated pair consisting of 'LookUnderMasks' and one of these options:

Option to treat search expressions as regular expressions specified as the comma-separated pair consisting of 'RegExp' and 'on' to treat search expressions as regular expressions or 'off'. To learn more about MATLAB^® regular expressions, see Regular Expressions.

Option to restrict the search depth to the specified level, specified as the comma-separated pair consisting of 'SearchDepth' and a positive integer character vector or string scalar. For example, specify '0' to search loaded systems only, '1' for blocks and subsystems of the top-level system, '2' for the top-level system and its children, etc. The default is to search all levels.

Options for searching variants, specified as the comma-separated pair consisting of 'Variants' and one of these options:

A Function handle to match elements in a search, such as blocks, system, lines, ports, and annotations. Use MatchFilter to determine whether the elements should be selected or skipped in a search.

Example: Use MatchFilter to find all non Inport and Outport blocks in a model using your own defined filter function, nonInOutBlocks:

blks = find_system('ModelName', 'MatchFilter', @nonInOutBlocks)

function match = nonInOutBlocks(handle)
match = true;

if strcmp(get_param(handle, 'Type'), 'block')
  blockType = get_param(handle, 'BlockType');
  if strcmp(blockType, 'Inport') || ...
        strcmp(blockType,  'Outport')
      match = false;
  end
end
end

This example shows how to use MatchFilter with second output argument prune.

 [match, prune] = fcn(element)
 where
  element - Handle of the block being processed.
  match   - Logical. If false, skip the element.
  prune   - Optional logical (default false). If true, do not look in subsystems.

Variants: Simulink provides Simulink.match.activeVariants and Simulink.match.codeCompileVariants match filter functions for variant blocks, which you can use to find active variants or code compile variant blocks. To do so, compile the model and apply the appropriate MatchFilter options:

Example: Use Simulink.match.activeVariants option to find active variants in a model:

set_param(model, 'SimulationCommand', 'update');
activeBlks = find_system(model, 'MatchFilter', @Simulink.match.activeVariants);

Example: Use Simulink.match.codeCompileVariants option to find variant choices that are part of the generated C code:

 MODEL([],[],[],'compileForRTW')
 find_system(MODEL, 'MatchFilter', @Simulink.match.codeCompileVariants);
 MODEL([],[],[],'term')