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    <p>While you need to remember that thread safety has to take into account the surrounding code as well, you appear to be in luck. The fact that <a href="http://java.sun.com/javase/6/docs/api/java/util/regex/Matcher.html" rel="nofollow noreferrer">Matchers</a> are created using the Pattern's <a href="http://java.sun.com/javase/6/docs/api/java/util/regex/Pattern.html#matcher%28java.lang.CharSequence%29" rel="nofollow noreferrer">matcher</a> factory method and lack public constructors is a positive sign. Likewise, you use the <a href="http://java.sun.com/javase/6/docs/api/java/util/regex/Pattern.html#compile%28java.lang.String%29" rel="nofollow noreferrer">compile</a> static method to create the encompassing <a href="http://java.sun.com/javase/6/docs/api/java/util/regex/Pattern.html" rel="nofollow noreferrer">Pattern</a>.</p> <p>So, in short, if you do something like the example:</p> <pre><code>Pattern p = Pattern.compile("a*b"); Matcher m = p.matcher("aaaaab"); boolean b = m.matches(); </code></pre> <p>you should be doing pretty well.</p> <p>Follow-up to the code example for clarity: note that this example strongly implies that the Matcher thus created is thread-local with the Pattern and the test. I.e., you should not expose the Matcher thus created to any other threads.</p> <p>Frankly, that's the risk of any thread-safety question. The reality is that <strong>any</strong> code can be made thread-unsafe if you try hard enough. Fortunately, there are <a href="http://jcip.net/" rel="nofollow noreferrer">wonderful</a> <a href="http://java.sun.com/docs/books/effective/" rel="nofollow noreferrer">books</a> that teach us a whole bunch of ways that we could ruin our code. If we stay away from those mistakes, we greatly reduce our own probability of threading problems.</p>
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    1. POIs Java Regex Thread Safe?
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    1. COwhat does this have to do with thread safety?
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      1. USJason S
    2. CO@Jason S: thread locality is one very straightforward way to achieve thread safety even if the internal code isn't thread safe. If only one method could ever possibly access a particular method at a time, you've enforced thread safety externally.
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    3. COok, so you are just saying that re-creating a pattern from a string at the point of use, is better than storing it to be efficient, at the risk of dealing with concurrency issues? i'll grant you that. I was confused with that sentence about factory methods and public constructors, that seems like a red herring w/r/t this topic.
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