CPP + Regular Expression to Validate URL
Have you tried using the RFC 3986 suggestion? If you're capable of using GCC-4.9 then you can go directly with <regex>
.
It states that with ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?
you can get as submatches:
scheme = $2
authority = $4
path = $5
query = $7
fragment = $9
For example:
int main(int argc, char *argv[])
{
std::string url (argv[1]);
unsigned counter = 0;
std::regex url_regex (
R"(^(([^:\/?#]+):)?(//([^\/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?)",
std::regex::extended
);
std::smatch url_match_result;
std::cout << "Checking: " << url << std::endl;
if (std::regex_match(url, url_match_result, url_regex)) {
for (const auto& res : url_match_result) {
std::cout << counter++ << ": " << res << std::endl;
}
} else {
std::cerr << "Malformed url." << std::endl;
}
return EXIT_SUCCESS;
}
Then:
./url-matcher http://localhost.com/path\?hue\=br\#cool
Checking: http://localhost.com/path?hue=br#cool
0: http://localhost.com/path?hue=br#cool
1: http:
2: http
3: //localhost.com
4: localhost.com
5: /path
6: ?hue=br
7: hue=br
8: #cool
9: cool
user701960
Updated on June 14, 2022Comments
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user701960 over 1 year
I want to build a regular expression in c++{MFC} which validates the URL.
The regular expression must satisfy following conditions.
Valid URL:- http://cu-241.dell-tech.co.in/MyWebSite/ISAPIWEBSITE/Denypage.aspx/ http://www.google.com http://www.google.co.in
Invalid URL:-
http://cu-241.dell-tech.co.in/\MyWebSite/\ISAPIWEBSITE/\Denypage.aspx/ = Regx must check & invalid URL as '\' character between "/\MyWebSite/\ISAPIWEBSITE/\Denypage.aspx/"
http://cu-241.dell-tech.co.in//////MyWebSite/ISAPIWEBSITE/Denypage.aspx/ = Regx must check & invalidate URL due to multiple entries of "///////" in url.
http://news.google.co.in/%5Cnwshp?hl=en&tab=wn = Regex must check & invalidate URL for additional insertion of %5C & %2F character.
How can we develop a generic Regular Expression satisfying above condition. Please, Help us by providing a regular expression that will handle above scenario's in CPP{MFC}
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Julius over 7 yearsThis is working really great. Could you show me how to use this to extract all matching urls in a string using the regex? I tried to use it with sregex_iterator but I don't get any matches. Thank you very much!
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Lothar over 7 yearsUnforutnately this is not for validating but for splitting a correct URI into its parts. It will not even detect the most simple cases, like unencoded spaces.
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Lorien Brune about 6 yearsThanks for such a useful and well-explained answer. This is the best all-around URL parsing script I've found for accuracy, ease of use, and quickness of implementation. And you don't need to download any special libraries! It would make a great answer to this question: stackoverflow.com/q/2616011/1043704
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Lorien Brune about 6 yearsNote that if a port is present, it will be included in elements 3 and 4. I.e.,
http://localhost.com:8888/path?hue=br#cool
results in3: //localhost.com:8888
and4: localhost.com:8888
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Andrey Nekrasov almost 3 yearsnot working, "aaa" will be accepted by this expression