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# source_group

Define a grouping for source files in IDE project generation.

    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:

    source_group(outer\\inner ...)

For backwards compatibility, the short-hand signature

    source_group(<name> <regex>)

is equivalent to

    source_group(<name> REGULAR_EXPRESSION <regex>)

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