Hi, The iostreams library has a basic_regex_filter that will do this job. See http://www.boost.org/libs/iostreams/doc/classes/regex_filter.html or in context http://www.boost.org/libs/iostreams/doc/index.html 4. Reference -> 4.2 Classes -> basic_regex_filter The following ctor is the one you probably want basic_regex_filter( const basic_regex& pattern, const formatter& replace, regex_constants::match_flag_type flags = regex_constants::match_default ); It takes a regex (and regex flags) and for each match calls the formatter function. The formatter is a boost::function1 that takes the match_results and is expected to return a string that will be used to replace the match. You will probably have to put your src/dst strings into stringstreams to use the filter. Note that the library does support a generous additional variety of sinks and sources , files, arrays, zip archives etc. Please note that I recently found a bug in basic_regex_filter in cases where no match is found. See my earlier posts for a fix. regards, Andrew

-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org]On Behalf Of Johan Nilsson Sent: Monday, 22 May 2006 7:53 PM To: boost-users@lists.boost.org Subject: [Boost-users] [Regex] Replace algorithm

Hi,

I'd like to replace all parts of a string with the results of calling a function, passing the match as a parameter. Some pseudo-code:

--- std::string replacer(smatch& s) { return std::getenv(s[1].c_str()); }

std::string const input = "This is ${USER} on ${HOST}"; boost::regex const re("\\$\\{([^\\}]+)\\}"); std::string result = boost::regex_replace(input, re, boost::bind(&replacer));

assert("This is Me on MyWorkstation" == result); ---

(I'm sure there are errors above, but I hope you get the general idea).

Any easy way to do something similar?

// Johan

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