Re: [Boost-users] boost::xpressive use of before(...)

On 17/04/2019 21:39, Simon Giddings wrote:

std::string strInput = "&9-A02FEfoo"; sregex re;

re = bos >> as_xpr("&9-A02FE") >> before("foo"); if(regex_match(strInput, sm, re)) {     strResult = "matched : " + sm[0].str(); }

regex_match requires matching the entire string. "before" is a lookahead assertion, which means it doesn't actually consume the "foo" in the input, so the match fails. Use regex_search instead if you want to find partial matches.