--- UOJ-System/web/app/libs/uoj-validate-lib.php	2022-12-30 09:54:05.452022649 +0800
+++ UOJ-Luogu-RemoteJudge/web/app/libs/uoj-validate-lib.php	2023-03-21 21:23:42.635610391 +0800
@@ -47,3 +47,7 @@
 function validateIP($ip) {
 	return filter_var($ip, FILTER_VALIDATE_IP) !== false;
 }
+
+function validateLuoguProblemId($str) {
+	return preg_match('/^(P|B)[1-9][0-9]{3,5}$/', $str);
+}