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+source_group
+------------
+
+Define a grouping for source files in IDE project generation.
+There are two different signatures to create source groups.
+
+::
+
+  source_group(<name> [FILES <src>...] [REGULAR_EXPRESSION <regex>])
+  source_group(TREE <root> [PREFIX <prefix>] [FILES <src>...])
+
+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:
+
+``TREE``
+ CMake will automatically detect, from ``<src>`` files paths, source groups
+ it needs to create, to keep structure of source groups analogically to the
+ actual files and directories structure in the project. Paths of ``<src>``
+ files will be cut to be relative to ``<root>``.
+
+``PREFIX``
+ Source group and files located directly in ``<root>`` path, will be placed
+ in ``<prefix>`` source groups.
+
+``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 and ``<prefix>`` argument may contain backslashes
+to specify subgroups:
+
+.. code-block:: cmake
+
+  source_group(outer\\inner ...)
+  source_group(TREE <root> PREFIX sources\\inc ...)
+
+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>)