web: add already solved challenges

web/match_the_regex/solution.md

@@ -0,0 +1,16 @@
+```javascript
+	function send_request() {
+		let val = document.getElementById("name").value;
+		// ^p.....F!?
+		fetch(`/flag?input=${val}`)
+			.then(res => res.text())
+			.then(res => {
+				const res_json = JSON.parse(res);
+				alert(res_json.flag)
+				return false;
+			})
+		return false;
+	}
+```
+
+`picoCTF` -> `picoCTF{succ3ssfully_matchtheregex_f89ea585}`