core: import.syzoj: fix bulk operation

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.36.0",
+    "version": "2.36.1",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",

packages/hydrooj/src/handler/import.ts

@@ -294,8 +294,8 @@ class ProblemImportSYZOJHandler extends Handler {
         domainId: string, url: string, targetPid: string, hidden = false,
         prefix: string, start: number, end: number,
     ) {
-        if (/^(.+)(\d+)\.\.(\d+)$/.test(url)) {
-            const res = /^(.+)(\d+)\.\.(\d+)$/.exec(url)!;
+        if (/\/(\d+)\.\.(\d+)$/.test(url)) {
+            const res = /\/(\d+)\.\.(\d+)$/.exec(url)!;
             prefix = res[1];
             start = +res[2];
             end = +res[3];