Function hasSubstringInArea

src/utils/string.cpp:713–724

* @brief Returns @c true if @a str has substring @a withWhat in area * bordered by offsets @a start and @a stop. */

*        bordered by offsets @a start and @a stop.
*/
bool hasSubstringInArea(const std::string &str, const std::string &withWhat,
		std::string::size_type start, std::string::size_type stop) {
	if (start > stop) {
		return false;
	}

	const auto stopIndex = stop + 1;
	const auto stopIterator = stopIndex < str.size() ?
		str.begin() + stopIndex : str.end();
	return std::search(str.begin() + start, stopIterator, withWhat.begin(),
		withWhat.end()) != stopIterator;
}

/**
* @brief Returns @c true if @a str is composed solely of chars in @a chars, @c