![]() All you need is an input sequence, a regex object, and a format string or a formatter object. The type of the regular expression in Boost.Xpressive depends on the type of. regexreplace() Performing search-and-replace using regexreplace() is simple. However, there is a fundamental difference between Boost.Xpressive and Boost.Regex. xpressive provides the regexreplace() algorithm for searching and replacing. (Edit : There is now a good comparison between Boost and PCRE. And one of the most common text manipulation tasks is search-and-replace. boost::xpressive::regexreplace Build an output sequence given an input sequence, a regex, and a format string or a formatter object, function, or expression. ![]() The solution is to try both and see which is more performant for the OP's specific situation. And using boost will probably give you more flexibility and performance tuning options if you need them.įinal Note: There are no known direct comparisons between boost.regex and Perl's regex in terms of performance. List of languages and frameworks including regular expression support. It wouldnt be the first time an interface was accepted into C++ that seemed great at the time, but possibly better alternates were discovered later. See here for some information about an algorithm that beats Perl's regular expression for some expressions.ĮDIT: It is possible to overcome the startup cost of starting a full perl interpreter by linking to libperl or using libPCRE. Regex Note 1 Boost C Libraries C Boost Boost.Xpressive Boost C Librar. The Boost.Regex interface has already been accepted as > the TR1 regex interface. The real answer is that I do not know of any such comparison, but Perl's regular expression facilities are not necessarily the fastest. Boost.Xpressive, Yes, Yes, Yes, Yes, Yes, Yes, Yes, Yes, Yes. Requires: Type BidiIter meets the requirements of a Bidirectional Iterator (24.1.4). The exception would be if you have a VERY complicated regular expression that Perl's regex implementation happens to be optimised for but boost's regex engine isn't. This is a comparison of regular expression engines. boost::xpressive::regexreplace Build an output sequence given an input sequence, a regex, and a format string or a formatter object, function, or expression. The startup cost of running a Perl interpreter from within your application (via the system function I presume) will outweigh any benefits you gain over using Perl's regex engine.
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