This was done with this script:

    #!/bin/bash

    set -eou pipefail

    # Use C++11 sstream constructor from string
    # Exclude 'ThirdParty' because it uses ossimFilename type
    find Modules/ Examples/ -not -iwholename "*ThirdParty*" -type f -print0 | xargs -0 sed -i -E "s/std::ifstream (.*)\((.*)\.c_str\(\)/std::ifstream \1\(\2/"
    find Modules/ Examples/ -not -iwholename "*ThirdParty*" -type f -print0 | xargs -0 sed -i -E "s/std::ofstream (.*)\((.*)\.c_str\(\)/std::ofstream \1\(\2/"

    # Use C++11 ::open(const std::string&) of ifstream, ofstream, etc.
    # Exclude ThirdParty because of ossimFilename type
    find Modules/ Examples/ -not -iwholename "*ThirdParty*" -type f -print0 | xargs -0 sed -i -E "s/\.open\((.*).c_str\(\)/\.open\(\1/"

    # No need for c_str when outputing to std::cout and such
    find Modules/ Examples/ -type f -print0 | xargs -0 sed -i -E "s/\.c_str\(\) ?<</ <</"

    # Use itk::ExceptionObject::SetDescription and SetLocation string versions
    find Modules/ Examples/ -type f -print0 | xargs -0 sed -i -E "s/e\.SetDescription\((.*)\.c_str\(\)\)/e\.SetDescription\(\1\)/"
    find Modules/ Examples/ -type f -print0 | xargs -0 sed -i -E "s/e\.SetLocation\((.*)\.c_str\(\)\)/e\.SetLocation\(\1\)/"

    # Use itksys::SystemTool:: string versions
    find Modules/ Examples/ -type f -print0 | xargs -0 sed -i -E "s/itksys::SystemTools::(.*)\((.*)\.c_str\(\)/itksys::SystemTools::\1\(\2/"
    # Exclude otbLogger because it uses GetCurrentDateTime which does not have a string version
    git checkout --  Modules/Core/Common/src/otbLogger.cxx
    # Exclude test/otbOGRLayerStreamStitchingFilter.cxx because there's a double use which is not compatible with the regex
    git checkout -- Modules/Segmentation/OGRProcessing/test/otbOGRLayerStreamStitchingFilter.cxx

Earlier one needs all otb modules to build examples. This single commit
activate an example and its related test if and only if all of its
dependent module is activated. The check for a module is done using
<Module>_LOADED cmake variable. With this change, activating
BUILD_EXAMPLES=ON works flawlessly irrespective of your build configuration.

modifications generated via the script FindRedundantHeaderIncludes.py

Ancient versions of CMake required else(), endif(), and similar block
termination commands to have arguments matching the command starting the
block.  This is no longer the preferred style.

NOTE: MUST USE GNU compliant version of sed
Run the following shell code (Adopted from Brad King scripts for CMake):

for c in else endif endforeach endfunction endmacro endwhile; do
    echo 's/\b'"$c"'\(\s*\)(.\+)/'"$c"'\1()/'
done >convert.sed \
&& git ls-files -z -- bootstrap '*.cmake' '*.cmake.in' '*CMakeLists.txt' \
   | xargs sed -i -f convert.sed \
&& rm convert.sed


This has been adapted from ITK commit e52dbe7fa476f6283c9b9d1507fca052355113a4

This modification is based according to
the process described in ITK/Utilities/Maintenance/HowToCreateTheCMakeCaseConversion.txt

ENH: Classification Map Regularization: only input image type is templated in the declaration of the filtertype in the tests, example and application