Is Java Regex Thread Safe?

by

Yes, from the Java API documentation for the Pattern class

Instances of this (Pattern) class are immutable and are safe for use by multiple concurrent threads. Instances of the Matcher class are not safe for such use.

If you are looking at performance centric code, attempt to reset the Matcher instance using the reset() method, instead of creating new instances. This would reset the state of the Matcher instance, making it usable for the next regex operation. In fact, it is the state maintained in the Matcher instance that is responsible for it to be unsafe for concurrent access.

More Related Contents:

  1. Cancelling a long running regex match?
  2. Java Variable Substitution
  3. I have wondered why ‘new Thread(new Thread(),”string”);’ is running correctly
  4. What does java.lang.Thread.interrupt() do?
  5. Java multi-threading & Safe Publication [closed]
  6. How to split a string, but also keep the delimiters?
  7. Are Java static initializers thread safe?
  8. A regex to match a substring that isn’t followed by a certain other substring
  9. Multithreaded quicksort or mergesort
  10. java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-4
  11. Java regular expressions and dollar sign
  12. Java doesn’t work with regex \s, says: invalid escape sequence
  13. Turning an ExecutorService to daemon in Java
  14. Why String.replaceAll() in java requires 4 slashes “\\\\” in regex to actually replace “\”?
  15. Is ExecutorService (specifically ThreadPoolExecutor) thread safe?
  16. Use cases for RxJava schedulers
  17. Impossible to make a cached thread pool with a size limit?
  18. How to escape comma and double quote at same time for CSV file?
  19. Are Thread.stop and friends ever safe in Java?
  20. Should you synchronize the run method? Why or why not?
  21. Who is calling the Java Thread interrupt() method if I’m not?
  22. Java thread creation overhead
  23. How can I wrap a method so that I can kill its execution if it exceeds a specified timeout?
  24. How to analyze a java thread dump?
  25. Pattern to extract text between parenthesis
  26. How to listen for Firebase setValue completion
  27. Regex search with pattern containing (?:.|\s)*? takes increasingly long time
  28. What makes the execution order of threads unpredictable?
  29. Why is Thread.stop() so dangerous
  30. regex replace all ignore case

Leave a Comment