Allow repeated separators

Author: benlangmuir

test/SourceKit/Sema/educational_note_diags.swift

@@ -4,7 +4,7 @@ extension (Int, Int) {}
 
 // DESCRIPTIVE:      key.description: "non-nominal type
 // DESCRIPTIVE:      key.educational_note_paths: [
-// DESCRIPTIVE-NEXT:   "{{/|\\}}educational{{/|\\}}notes{{/|\\}}path{{/|\\}}prefix{{/|\\}}nominal-types.md"
+// DESCRIPTIVE-NEXT:   "{{[/\\]+}}educational{{[/\\]+}}notes{{[/\\]+}}path{{[/\\]+}}prefix{{[/\\]+}}nominal-types.md"
 // DESCRIPTIVE-NEXT: ]
 
 // RUN: %sourcekitd-test -req=sema %s -- %s | %FileCheck %s -check-prefix=DESCRIPTIVE-DISABLED