1 files changed, 40 insertions, 0 deletions
diff --git a/hello.cpp b/hello.cpp
new file mode 100644
index 0000000..c56dd7b
--- /dev/null
+++ b/hello.cpp
@@ -0,0 +1,40 @@
+#include <iostream>
+#include <string>
+#include <regex>
+
+static std::string get_next_filename(std::string filename)
+{
+	std::regex
+		numbered_reg("(.[^.]*)[(]([1-9][0-9]{0,8})[)](([.].*)?)"),
+		unnumbered_reg("(.[^.]*)(([.].*)?)");
+	std::smatch what;
+	std::string base_name, number, rest;
+	long new_idx;
+
+	if (regex_match(filename, what, numbered_reg)) {
+		base_name = what[1];
+		number = what[2];
+		rest = what[3];
+		new_idx = std::stol(number) + 1;
+	} else {
+		regex_match(filename, what, unnumbered_reg);
+		base_name = what[1];
+		rest = what[2];
+		new_idx = 1;
+	}
+	std:: cout << filename << "  ";
+	return base_name + "(" + std::to_string(new_idx) + ")" + rest;
+}
+
+int main()
+{
+	std::cout << get_next_filename("dupa(1)") << std::endl;
+	std::cout << get_next_filename("dupa(1).txt") << std::endl;
+	std::cout << get_next_filename("....dupa(1).txt") << std::endl;
+	std::cout << get_next_filename("dupa(01).kupa(22).png") << std::endl;
+	std::cout << get_next_filename("dupa(1)e..txt") << std::endl;
+	std::cout << get_next_filename("dupa(111111111).txt") << std::endl;
+	std::cout << get_next_filename("dupa(1111111111).txt") << std::endl;
+	std::cout << get_next_filename("dupa.txt") << std::endl;
+	return 0;
+}