that page's description of regex_match has got to be wrong. what good use
is there to match the entire line to the regex? seriously, think about it.
I would substitute the abiguous term "target" for some other more specific
variable name listed below.
On Wed, November 2, 2016 8:30 pm, NightStrike wrote:
> On Wed, Nov 2, 2016 at 9:07 PM, Jim Michaels <jim.micha...@jesusnjim.com>
> wrote:
>
>> #include <regex>
>> #include <iostream>
>> int main(void) {
>> std::cout<<(std::regex_match("abcdefg",std::regex("def",std::regex_cons
>> tants::extended))?"true":"false")<<std::endl;
>> return 0;}
>>
>> corrected some more bugs in that example and got "false". not sure why
>> this is. sorry for the bumpy ride.
>
> This is, like your previous issue, due to your lack of understanding
> the rules of C++ (specifically, the C++ Standard Library). You should make
> use of cppreference.com, as it's a very good information source here. If
> you did, you'd see this:
>
> http://en.cppreference.com/w/cpp/regex/regex_match
> "...Determines if there is a match between the regular expression e
> and the entire target character sequence [first,last)...."
>
> What you really want is this:
>
>
> http://en.cppreference.com/w/cpp/regex/regex_search
> "....Determines if there is a match between the regular expression e
> and some subsequence in the target character sequence...."
>
> Notice the difference? The function you are using matches on the
> entire string, and thus only returns true if the regex is true for the
> entire string. The second function operates on a substring, which is what
> you want here. It's more like "grep" in this regard, if that analogy
> works for you.
>
> Please try to read the documentation of the language.
>
>
>> the function below is an old namespace clash bug between user-defined
>> str and compiler's std for string and maybe algorithm.
>
> No, it was your incorrect use of namespace syntax. The compiler is fine.
>
>
>> I could suppose it might be 10 years for a fix for that to reach gcc...
>> :-( I know you folks are really busy. I just want a working and
>> hopefully up-to-date compiler from somewhere for windows that isn't
>> waving the dragon flag (you've *got* to be serious folks, those things
>> are nasty).
>
> I think you should update your knowledge of the language. I also
> think you should ask these basic, fundamental language questions in a forum
> that is geared toward this sort of thing. You have been emailing this
> list for years now, and aside from one or two exceptions (you did point
> out a valid bug or two), every email has been off topic. We are generally
> pretty lenient, and try to be a helpful audience. But then, you aren't
> very nice about it, either. Honestly, you're kind of a mean, highly
> insulting person that demands basic "google search" help on the wrong
> topic from the wrong people. I don't understand why you do this
> repeatedly, year after year.
>
> I hope you realize what mingw-w64 is and is not: It is a project that
> provides headers and imports to the Windows APIs. As a nicety, we also
> host some compiler toolchains that kind people build as a convenience
> ONLY. We are *NOT* GCC. You can find that project at
> gcc.gnu.org, whereas we are at mingw-w64.sf.net. We are also not a general
> programming help forum. We tend to be nice people that help each other
> out, and I myself have asked lots of questions over the years that are
> unrelated to mingw-w64, both on the list and mainly in IRC. But just like
> you wouldn't try to buy postage stamps at a restaurant, you are really
> barking up the wrong tree here. I think, honestly, what you really need
> is a good programming resource or tutor. Perhaps lynda.com can be of help
> here, or irc://irc.freenode.net/##C++-general
>
>
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--
Jim Michaels
jim.micha...@jesusnjim.com
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