fix(unplugin): keep hex character codes in param segments regexp (#2811)

Author: kwy404

packages/router/src/unplugin/core/tree.spec.ts

@@ -1345,6 +1345,12 @@ describe('Tree', () => {
       })
     })
 
+    it('keeps hex character codes in segments with params', () => {
+      checkRegexp('[id][x+2E]json', '/^\\/([^/]+?)\\.json$/i', {
+        matcherParts: [[1, '.', 'json']],
+      })
+    })
+
     it('works with a catch all route', () => {
       checkRegexp('[...all]', '/^\\/(.*)$/i', {
         matcherParts: [0],

packages/router/src/unplugin/core/treeNodeValue.ts

@@ -723,7 +723,9 @@ function parseFileSegment(
           `Invalid hex code "${buffer}" in segment "${segment}"`
         )
       }
-      pathSegment += String.fromCharCode(parseInt(buffer, 16))
+      const char = String.fromCharCode(parseInt(buffer, 16))
+      pathSegment += char
+      subSegments.push(char)
     }
     buffer = ''
   }