I just noticed that although the class char_delimiters_separator is deprecated it is used by default by Boost.Tokenizer. I don't know when char_delimiters_separator was deprecated in favor of char_separator but it goes back to 1.33.1 (see http://www.boost.org/doc/libs/1_33_1/libs/tokenizer/index.html). Any plan to change the default class soon (doesn't need to be in 1.39.0 of course as it's pretty late for such a change)? Boris