I recently downloaded the boost regex library and am trying to use the search and replace (regex_merge) API. But I am not getting the expected result.

Here is what I am trying to do. I am trying to replace a single quoted string with something. But, the catch here is that the string in single quotes can have zero or many 2 consecutive single quotes. For example:

Input (Ignore the angle brackets>: <foo='string with '' consecutive '' single ''quotes' bar='string with no single quotes'> To be replaced by 'XXX'. So the output that I want: <foo=XXX bar=XXX>

Here is the regular expression that I wrote in Perl: /(\'[^']*(\'\')*[^']*\')/

I get the expected result in Perl.

Actually are you really sure that this works in perl: IMO it shouldn't, since it can never match a string with more than *one* '' embedded in it, I think you should be using: /((?:\'[^']*\')+)/ John Maddock http://ourworld.compuserve.com/homepages/john_maddock/index.htm

So, to test this with regex library I wrote a sample program to use the regex_merge API and try the replace functionality. ---------------------------replace.cc-------------------------------- #include <boost/regex.hpp> #include <string> #include <iostream> #include <sstream> #include <iterator>

using namespace std; using namespace boost;

const std::string formatstr("XXX");

std::string processexp(string resp) { regex expression("(\'[^']*(\'\')*[^']*\')"); std::string result; std::ostringstream t; std::ostream_iterator<char, char> oi(t); cout << "Response:" << resp << endl; result = boost::regex_merge(resp, expression, formatstr, boost::format_all); return result; }

int main(int argc) { std::string res;

res = processexp("foo='string with '' consecutive '' single ''quotes' bar='string with no single quotes'"); cout << "results=" << res << endl; return 0; } --------------------------------------------------------------------- The output I get is: foo=REPLACEDREPLACED bar=REPLACED

I tried several ways, but couldn't get the regular expression to work to return the expected result.

I WOULD really appreciate if someone could help me.

Thanks in advance,

Sameer

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