src/java.base/share/classes/java/util/regex/Pattern.java

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rev 10552 : 8055723[core]: Replace concat String to append in StringBuilder parameters
Contributed-by: Otavio Santana <otaviojava@java.net>

@@ -1486,14 +1486,14 @@
 
         // Add combined permutations
         for(int x=0; x<perms.length; x++) {
             String next = base + perms[x];
             if (x>0)
-                result.append("|"+next);
+                result.append('|').append(next);
             next = composeOneStep(next);
             if (next != null)
-                result.append("|"+produceEquivalentAlternation(next));
+                result.append('|').append(produceEquivalentAlternation(next));
         }
         return result.toString();
     }
 
     /**