I try to understand the IncludeIsMainRegex setting of clang-format http://releases.llvm.org/3.9.0/tools/clang/docs/ClangFormatStyleOptions.html
My cpp file indention.cpp contains includes:
Now I try to assess what affect IncludeIsMainRegex has:
1) IncludeIsMainRegex: '$' (default for style LLVM)
clang-format -style=file indention.cpp
shows no effect
2) IncludeIsMainRegex: ''
3) IncludeIsMainRegex: 'hpp$'
4) IncludeIsMainRegex: '\.hpp$
5) IncludeIsMainRegex: '.hpp$
According to the documentation I expected that 2 and 3 match the suffix and assign category 0 to the include, thus placing it at the top.
Where is my understanding wrong?