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source_group
------------
Define a grouping for source files in IDE project generation.
.. code-block:: cmake
source_group(<name> [FILES <src>...] [REGULAR_EXPRESSION <regex>])
Defines a group into which sources will be placed in project files.
This is intended to set up file tabs in Visual Studio.
The options are:
``FILES``
Any source file specified explicitly will be placed in group
``<name>``. Relative paths are interpreted with respect to the
current source directory.
``REGULAR_EXPRESSION``
Any source file whose name matches the regular expression will
be placed in group ``<name>``.
If a source file matches multiple groups, the *last* group that
explicitly lists the file with ``FILES`` will be favored, if any.
If no group explicitly lists the file, the *last* group whose
regular expression matches the file will be favored.
The ``<name>`` of the group may contain backslashes to specify subgroups:
.. code-block:: cmake
source_group(outer\\inner ...)
For backwards compatibility, the short-hand signature
.. code-block:: cmake
source_group(<name> <regex>)
is equivalent to
.. code-block:: cmake
source_group(<name> REGULAR_EXPRESSION <regex>)
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