Why this regex pattern matching does not work

I am implementing RESTful query with JPA specification. Would like to handle url with multiple criteria that looks like this:

http://localhost:8080/samples?search=lastName:doe,age>25

The search string would match pattern (\\w+?)(:|<|>)(\\w+?) separated by ",".

Therefore, I wrote the following code to obtain Matcher from a string:

static Matcher getMatcherFromString(String str) {                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
    Pattern pattern = Pattern.compile("(\\w+?)(:|<|>)(\\w+?),");
    Matcher matcher = pattern.matcher(str + ",");
    return matcher;
}

This method is then called in controller to parse the url.

However, when I tested the method with string analysisId:fdebfd6e-d046-4192-8b97-ac9f65dc2009, it returns null. Why did I do wrong for the pattern matching?