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

rev 10521 : 8055723[core]: Replace concat String to append in StringBuilder parameters
Contributed-by: Otavio Santana <otaviojava@java.net>

*** 1486,1499 ****
  
          // Add combined permutations
          for(int x=0; x<perms.length; x++) {
              String next = base + perms[x];
              if (x>0)
!                 result.append("|"+next);
              next = composeOneStep(next);
              if (next != null)
!                 result.append("|"+produceEquivalentAlternation(next));
          }
          return result.toString();
      }
  
      /**
--- 1486,1499 ----
  
          // Add combined permutations
          for(int x=0; x<perms.length; x++) {
              String next = base + perms[x];
              if (x>0)
!                 result.append('|').append(next);
              next = composeOneStep(next);
              if (next != null)
!                 result.append('|').append(produceEquivalentAlternation(next));
          }
          return result.toString();
      }
  
      /**