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

rev 51919 : 8215281: Use String.isEmpty() when applicable in java.base
Reviewed-by: dfuchs, alanb

*** 1388,1398 ****
          capturingGroupCount = 1;
          localCount = 0;
          localTCNCount = 0;
  
          // if length > 0, the Pattern is lazily compiled
!         if (pattern.length() == 0) {
              root = new Start(lastAccept);
              matchRoot = lastAccept;
              compiled = true;
          }
      }
--- 1388,1398 ----
          capturingGroupCount = 1;
          localCount = 0;
          localTCNCount = 0;
  
          // if length > 0, the Pattern is lazily compiled
!         if (pattern.isEmpty()) {
              root = new Start(lastAccept);
              matchRoot = lastAccept;
              compiled = true;
          }
      }
*** 1421,1431 ****
          // Reset group index count
          capturingGroupCount = 1;
          localCount = 0;
          localTCNCount = 0;
  
!         if (pattern.length() > 0) {
              compile();
          } else {
              root = new Start(lastAccept);
              matchRoot = lastAccept;
          }
--- 1421,1431 ----
          // Reset group index count
          capturingGroupCount = 1;
          localCount = 0;
          localTCNCount = 0;
  
!         if (!pattern.isEmpty()) {
              compile();
          } else {
              root = new Start(lastAccept);
              matchRoot = lastAccept;
          }