diff --git a/src/main.rs b/src/main.rs
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
+use std::env;
 use regexp::Regexp;
 
-fn main() {
+fn test() {
 	let tests = ["", "a", "ab", "aabb", "abab", "abcd", "abcbcdbcd"];
 	for pattern in ["a(b|c)", "a*b*", "(ab)*", "a((bc)*d)*", "(a|b)*a(a|b)(a|b)(a|b)", "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"] {
 		println!("# {pattern}");
@@ -17,3 +18,22 @@ fn main() {
 		println!();
 	}
 }
+
+fn main() {
+	let args: Vec<String> = env::args().collect();
+	match args[1].as_str() {
+		"test" => test(),
+		"match" => {
+			let r = match Regexp::new(&args[2].to_string()) {
+				Ok(r1) => r1.determinize().reduce().normalize(),
+				Err(e) => {
+					panic!("ERROR: {e}");
+				}
+			};
+			println!("{}", r.eval(args[3].to_string()));
+		}
+		s => {
+			println!("An unknown command: \"{s}\". Use \"match\" or \"test\".")
+		}
+	}
+}