C++ finally catches up to Perl :-)
Compile time regular expression in C++
11–20 of 30 posts
Re: Compile time regular expression in C++
#12Re: Compile time regular expression in C++
#13This has been available in Lisp since at least 2004.
Re: Compile time regular expression in C++
#14This has been available in Lisp since at least 2004. https://github.com/edicl/cl-ppcre/
Great thanks, I'll use that
Re: Compile time regular expression in C++
#15This has been available in Lisp since at least 2004. https://github.com/edicl/cl-ppcre/
C++ has had run-time regular expressions in its standard library since C++11, but this is about compile-time regular expressions
Re: Compile time regular expression in C++
#16This has been available in Lisp since at least 2004. https://github.com/edicl/cl-ppcre/
C++ has had run-time regular expressions in its standard library since C++11, but this is about compile-time regular expressions
I've never used cl-ppcre myself, but its docs[1] claim that it provides compile-time regexes:
> CL-PPCRE uses compiler macros to pre-compile scanners at load time if possible. This happens if the compiler can determine that the regular expression (no matter if it's a string or an S-expression) is constant at compile time and is intended to save the time for creating scanners at execution time (probably creating the same scanner over and over in a loop).
Re: Compile time regular expression in C++
#17Since people is posting other lang implementations... someone did it for zig too (probably less polished than this C++ lib) [0]. It is nice that the regexes can be used at compile time too [1].
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0: https://github.com/alexnask/ctregex.zig
1: I think the difference between C++ template language and Zig comptime is that Zig's comptime is almost equal as Zig's regular language, whereas the experience of programming C++ templates almost feels like learning a separate, equally complex language.
Re: Compile time regular expression in C++
#18I'd love for someone to add this to rebar[1] so that we can get a good sense of how well it does against other general purpose regex engines. It will be a little tricky to add (since the build step will require emitting a C++ program and compiling it), but it should be possible. [1]: https://github.com/BurntSushi/rebar
The C++ standard library "general regex engine" is crap (at speed), so there's no competition on that front at least...
Re: Compile time regular expression in C++
#19Earlier quoted context omitted.
C++ has had run-time regular expressions in its standard library since C++11, but this is about compile-time regular expressions
I've never used cl-ppcre myself, but its docs[1] claim that it provides compile-time regexes: > CL-PPCRE uses compiler macros to pre-compile scanners at load time if possible. This happens if the compiler can determine that the regular expression (no matter if it's a string or an S-expression) is constant at compile time and is intended to save the time for creating scanners at execution time (probably creating the s…
I think this is more like caching the regex than creating it at compile time? Load time I think is basically runtime. I think lisp can be loaded and then rehydrated later, but I'm not sure how common that is.
Re: Compile time regular expression in C++
#20Boost Xpressive has had static/"compile time" regex in C++ since the mid 2000s
https://www.boost.org/doc/libs/1_83_0/doc/html/xpressive.htm...
A performance comparison would be interesting.