Java Pattern Matcher not grouping accordingly

Question

We got a Pattern:

Pattern TRANSLATION_RAW_PATTERN =  Pattern.compile("(?<key>(\\$\\{(?<keydata>.*?)\\}))|(?<value>(.*?))")

And an Input:

${something}${something.else}

And using an online Pattern matcher this should result in the two keydata groups of:

"something" and "something.else"

But, it actually results in "something}${something.else"

    String rawContents = getContents();
    Matcher contentMatcher = TRANSLATION_RAW_PATTERN.matcher(rawContents);

    while (contentMatcher.matches())
    {
        final String keyGroupMatching = contentMatcher.group("keydata");
        if (keyGroupMatching == null)
        {
            break;
        }

        rawContents = rawContents.replace("${" + keyGroupMatching + "}", I18n.translateToLocal(keyGroupMatching));
        contentMatcher = TRANSLATION_RAW_PATTERN.matcher(rawContents);
    }

    return rawContents;

This happens already on the first iteration. The first time it retrieves the group it already retrieves it wrong.

We're a bit puzzled here since all online Pattern matchers we tried return the correct groups.