In all cases, if you are familiar with how regexmatch() and regexsearch() in the Boost.Regex library work, xpressive's versions work the same way. Measures how long it takes to find and count non-overlapping occurrences with default settings. } #pragma GCC diagnostic push #pragma GCC diagnostic ignored " -Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #include #pragma GCC diagnostic pop ///Obtain all regex matches in a std::string //From GetRegexMatches. This page covers the basics of regex matching and searching. It's just a simple regex benchmark for different programming languages. V.push_back("GCC has not yet implemented std::regex") return v #include #include #include #include #include ///Obtain all regex matches in a std::string //From GetRegexMatches.htm const std::vector GetRegexMatchesCpp11( const std::string& /* s */, const std::regex& /* r */) Include(././ Libraries/ BoostAll.pri) SOURCES += main.cpp # QMAKE_CXXFLAGS += -std= c++11 -Wall -Wextra -Weffc++ # greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
Boost regex vs xpressive code#
Include(././ ConsoleApplication.pri) #Or use the code below List of languages and frameworks including regular expression support. CppGetRegexMatches/CppGetRegexMatches.pro Regex Note 1 Boost C Libraries C Boost Boost.Xpressive Boost C Librar.
Boost regex vs xpressive iso#
STL: GNU ISO C++ Library, version 4.9.2.Operating system(s) or programming environment(s) Download the Qt Creator project 'GetRegexMatches' (zip).GetRegexMatches is demonstrated in the tool RegexTester. So, yeah, the bad regex is a lot worse than the good one. The problem is that your post actually came after I had accepted an answer, and the solution was provided in the comments under an answer that didnt actually provide the solution.
The goal is to get the best performance as the product that runs this code hits it a great deal. Meaning the standard library returns the first match in a multi line input that produces multiple matches. 3 The bad regular expression took on average 10,100 milliseconds to process all 1,000,000 lines, while the good regular expression took just 240 milliseconds. Having difficulty getting the boost regex match results to come out in the same way as the standard library.
GetRegexMatches is a Regex code snippet to obtainĪll std::strings in a std::string that satisfy a regular expression. I ran a small performance test 2 that feeds in 1,000,000 lines of the non-matching text to each regular expression in turn.
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