Regex Matching works improperly

[heni]

I try next simple code

        String template = "[]|[]{2}";
        TokenSequencePattern pattern = TokenSequencePattern.compile(template);
        Annotation document = new Annotation("word1 word2");
        new TokenizerAnnotator(false, "en").annotate(document);
        List<CoreLabel> tokens = document.get(CoreAnnotations.TokensAnnotation.class);

        if (pattern.getMatcher(tokens).matches())
            System.out.println("OK!");
        else
            System.out.println("BAD :(");

and it prints "BAD :(" instead of expected "OK"

[heni]

I have tried this code-snippet only with last version from Maven (3.6.0)

[J38]

What example text is this running on?

[heni]

the text is inside above code snippet: "word1 word2"

[heni]

and the problem is inside realization of matches function (when I add $ into regexp to simulate matches() behaviour at the level of regexp language - everything works perfectly)

[J38]

I'll forward this issue on to the developer of TokensRegex...I'd note that "String template = "[]{2} | []" works. I wonder if the issue arises with "X|Y" where X is a prefix of Y. Thank you for pointing out the error!

[heni]

Yep, thank you. Also this problem arises for case of non-greedy matching. See template "[]+?"