PathMather.matches(Path) don't agree with Pattern.matches(String,CharSequence) for some of predefined character classes. Please see the following test:
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import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Paths;

public class miniTest {
    public static void main(String[] args) {
        FileSystem fs = FileSystems.getDefault();
        System.out.println(fs.getPathMatcher("regex:foo\\d+").matches(Paths.get("foo012")));
        System.out.println(fs.getPathMatcher("regex:fo\\so").matches(Paths.get("fo o")));
        System.out.println(fs.getPathMatcher("regex:\\w+").matches(Paths.get("foo")));
    }
}
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It's output is
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false
false
false
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while all the results of the corresponding Pattern.matches(String, CharSequence) are true
Posted Date : 2009-07-29 15:19:26.0

N/A

This issue is specific to using the regex syntax on Windows. The common case, to use glob syntax, is not impacted. The issue is that the matching is done in uppercase (to be consistent with Path equals and compareTo). Unfortunately there is an oversight in that code and it is converting the regex constructs into uppercase.
Posted Date : 2009-07-29 15:28:50.0

Use the CASE_INSENSITIVE and UNICODE_CASE for windows regex match.
Posted Date : 2009-08-14 18:56:38.0