diff --git a/web/app/libs/uoj-validate-lib.php b/web/app/libs/uoj-validate-lib.php
index 21cf3b0..3aa778e 100644
--- a/web/app/libs/uoj-validate-lib.php
+++ b/web/app/libs/uoj-validate-lib.php
@@ -1,5 +1,5 @@
 <?php
 
 function validateLuoguProblemId($str) {
-	return preg_match('/^P[1-9][0-9]{3,5}$/', $str);
+	return preg_match('/^(P|B)[1-9][0-9]{3,5}$/', $str);
 }