In file included from /home/rbock/include/boost/regex/icu.hpp:1015,
                 from test.cpp:2:
/home/rbock/include/boost/regex/v4/u32regex_token_iterator.hpp:286: warning: unused parameter ‘submatch’
/home/rbock/include/boost/regex/v4/u32regex_token_iterator.hpp:348: warning: unused parameter ‘submatch’
/home/rbock/include/boost/regex/v4/perl_matcher.hpp: In function ‘bool boost::re_detail::can_start(charT, const unsigned char*, unsigned char) [with charT = unsigned int]’:
/home/rbock/include/boost/regex/v4/perl_matcher_common.hpp:787: instantiated from ‘bool boost::re_detail::perl_matcher<BidiIterator, Allocator, traits>::find_restart_any() [with BidiIterator = boost::u16_to_u32_iterator<const UChar*, unsigned int>, Allocator = std::allocator<boost::sub_match<boost::u16_to_u32_iterator<const UChar*, unsigned int> > >, traits = boost::icu_regex_traits]’
/home/rbock/include/boost/regex/v4/perl_matcher_common.hpp:245: instantiated from ‘bool boost::re_detail::perl_matcher<BidiIterator, Allocator, traits>::find_imp() [with BidiIterator = boost::u16_to_u32_iterator<const UChar*, unsigned int>, Allocator = std::allocator<boost::sub_match<boost::u16_to_u32_iterator<const UChar*, unsigned int> > >, traits = boost::icu_regex_traits]’
/home/rbock/include/boost/regex/v4/perl_matcher_common.hpp:229: instantiated from ‘bool boost::re_detail::perl_matcher<BidiIterator, Allocator, traits>::find() [with BidiIterator = boost::u16_to_u32_iterator<const UChar*, unsigned int>, Allocator = std::allocator<boost::sub_match<boost::u16_to_u32_iterator<const UChar*, unsigned int> > >, traits = boost::icu_regex_traits]’
/home/rbock/include/boost/regex/v4/regex_search.hpp:56:   instantiated from ‘bool boost::regex_search(BidiIterator, BidiIterator, boost::match_results<BidiIterator, Allocator>&, const boost::basic_regex<charT, traits>&, boost::regex_constants::match_flag_type, BidiIterator) [with BidiIterator = boost::u16_to_u32_iterator<const UChar*, unsigned int>, Allocator = std::allocator<boost::sub_match<boost::u16_to_u32_iterator<const UChar*, unsigned int> > >, charT = int, traits = boost::icu_regex_traits]’
/home/rbock/include/boost/regex/v4/regex_iterator.hpp:75:   instantiated from ‘bool boost::regex_iterator_implementation<BidirectionalIterator, charT, traits>::next() [with BidirectionalIterator = boost::u16_to_u32_iterator<const UChar*, unsigned int>, charT = int, traits = boost::icu_regex_traits]’
/home/rbock/include/boost/regex/v4/regex_iterator.hpp:142: instantiated from ‘boost::regex_iterator<BidirectionalIterator, charT, traits>& boost::regex_iterator<BidirectionalIterator, charT, traits>::operator++() [with BidirectionalIterator = boost::u16_to_u32_iterator<const UChar*, unsigned int>, charT = int, traits = boost::icu_regex_traits]’
/home/rbock/include/boost/regex/icu.hpp:847:   instantiated from ‘OutputIterator boost::re_detail::do_regex_replace(OutputIterator, const std::pair<I1, I1>&, const boost::u32regex&, const std::pair<I2, I2>&, boost::regex_constants::match_flag_type) [with OutputIterator = boost::utf16_output_iterator<boost::re_detail::unicode_string_out_iterator>, I1 = boost::u16_to_u32_iterator<const UChar*, unsigned int>, I2 = boost::u16_to_u32_iterator<const UChar*, unsigned int>]’
/home/rbock/include/boost/regex/icu.hpp:1008:   instantiated from here
/home/rbock/include/boost/regex/v4/perl_matcher.hpp:46: warning: comparison of unsigned expression < 0 is always false