[boost] [regex] regex_replace_example and the doc

Hi, I now recall this attractive example's mistake. <libs/regex/example/snippets/regex_replace_example.cpp> line89-90 maybe should be: extern const char* pre_expression = "(<)|(>)|(&)|\\r"; extern const char* pre_format = "(?1<)(?2>)(?3&)"; Thus, <libs/regex/doc/regex_replace.html> highlighted by this cpp is weird. :-) -- Regards, Shunsuke Sogame