boost string_algo简明使用

string_algo库是一个非常全面的字符串算法库，提供了大量的字符串操作函数，如大小写无关比较，修剪，特定模式的子串查找等，可以再不使用正则表达式的情况下处理大多数字符串相关问题。弥补了std::string的一些短处。

#include 
#include 
#include 

void SimpleUse()
{
	using namespace boost;
	using namespace std;
	string str("readme.txt");
	if (ends_with(str, "txt"))
	{
		cout << to_upper_copy(str) + " UPPER" << endl;
	}
	replace_first(str, "readme", "followme");
	cout << str << endl;
	vector v(str.begin(), str.end());
	vector v2 = to_upper_copy(
		erase_first_copy(v, "txt"));
	for (int i = 0; i < v2.size();i++)
    {
		cout << v2[i];
    }
	cout << endl;
}
void Upper_Lower()
{
	using namespace boost;
	using namespace std;
	string str("I Don't Know!");
	cout << to_upper_copy(str) << endl;
	cout << str << endl;;
	to_lower(str);
	cout << str << endl;;
}
void Predicates_use()
{
	using namespace boost;
	std::string str("I Don't Know!");
	assert(!starts_with(str, "i"));
	assert(istarts_with(str, "i"));

	assert(ends_with(str, "now!"));

	assert(icontains(str, "don't"));

	std::string str2 = to_lower_copy(str);
	assert(iequals(str, str2));

	assert(!ilexicographical_compare(str, "a"));

	std::string str3 = "THIS is upper";
	assert(all(str3.substr(0,4),is_upper()));

}

int main(int argc,char * argv[])
{
	SimpleUse();
	Upper_Lower();
	Predicates_use();
	std::cin.get();
	return 0;
}

结果：

详细参考：http://www.boost.org/doc/libs/1_55_0/doc/html/string_algo/reference.html