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The0neThe0nly
Expert Cheater
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Joined: 08 Dec 2009
Posts: 119
Location: In a box
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 Posted: Fri Aug 01, 2014 10:25 pm Post subject: [C++] Getting a set of numbers out of a string |
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I have a long string taken from a website using WinINet. There are some numbers surrounded by parentheses. These numbers change in length occasionally. I can use std::string::find to get the index of the first parentheses, but I've been having troubles getting the 2nd one right after it. And even then, I'm not sure if I am using std::string::substr right.
The snippet of the page code that has the numbers looks like this:
CreateLocale(5918239)
I want my code to return just 5918239 as int.
Right now, my code looks something like this:
"lol" is an std::string of the page source
| Code: | std::string lookingfor = "CreateLocale(";
std::string lookingfor2 = ")";
if (lol.find(lookingfor) == std::string::npos) {
printf("FATAL ERROR: Site may be undergoing maintenance right now\n");
system("pause");
return 0;
}
else if (lol.find(lookingfor2, (lol.find(lookingfor) + strlen("CreateLocale("))) == std::string::npos) {
printf("FATAL ERROR: Unspecified error\n");
system("pause");
return 0;
}
printf("Found it 1! Index: %d\n", lol.find(lookingfor));
printf("Found it 2! Index: %d\n", lol.find(lookingfor2, (lol.find(lookingfor) + strlen("CreateLocale("))));
std::string tempstr = (lol.substr((lol.find(lookingfor) + strlen("CreateLocale("))));
printf("Value 1: %s\n", tempstr); //lol.find(lookingfor2, (lol.find(lookingfor) + strlen("CreateLocale(")))));
system("pause");
return 0; |
Any ideas?
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atom0s
Moderator
 Reputation: 205
Joined: 25 Jan 2006
Posts: 8587
Location: 127.0.0.1
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| Posted: Sat Aug 02, 2014 2:01 am Post subject: |
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You could do it like this:
| Code: | std::string get_number(const std::string& str)
{
const std::string find_start = "CreateLocale(";
const std::string find_end = ")";
auto start = str.find(find_start, 0);
if (start == str.npos)
return "";
auto end = str.find(find_end, start);
if (start == str.npos)
return "";
start += find_start.size();
return str.substr(start, end - start);
} |
Testing like:
| Code: | std::string test1 = "CreateLocale(5918239)";
std::string test2 = "CreateLocale(59)";
std::string test3 = "CreateLocale(51532643535219)";
std::cout << get_number(test1) << std::endl;
std::cout << get_number(test2) << std::endl;
std::cout << get_number(test3) << std::endl; |
Results with:
5918239
59
51532643535219
Another method you do is with the new C++11 regex features:
| Code: |
#include <regex>
std::string get_number2(const std::string& str)
{
// Attempt to locate the given regular expression..
std::regex find_regex("CreateLocale\\(([0-9]+)\\)");
auto match_count(std::distance(std::sregex_iterator(str.begin(), str.end(), find_regex), std::sregex_iterator()));
// Validate we have a match..
if (match_count == 0)
return "";
// Create the result by using the matching group..
std::string result;
std::regex_replace(std::back_inserter(result), str.begin(), str.end(), find_regex, std::string("$1"));
return result;
} |
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