Java String.split pass in precompiled regex for performance reasons

Question

As the question states given the following code:

public class Foo {    public static void main(String[] args)    {            String test = "Cats go meow";            String[] tokens = test.split(" ");    } } 

is it possible to precompile that regex in the split function along the lines of this:

public class Foo {      Pattern pattern = Pattern.compile(" ");    public static void main(String[] args)    {            String test = "Cats go meow";            String[] tokens = test.split(pattern);    } } 

Answer 1

Yes, it is possible. Also, make pattern static so the static method main can access it.

public class Foo {      private static Pattern pattern = Pattern.compile(" ");    public static void main(String[] args)    {            String test = "Cats go meow";            String[] tokens = pattern.split(test);    } } 

According to the docs for the split method in String, you can use String's split or Pattern's split, but String's split compiles a Pattern and calls its split method, so use Pattern to precompile a regex.