为什么此正则表达式模式匹配不起作用

Question

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?

Answer 1

I got this to work: (\\w+?)(:|<|>)[a-zA-Z0-9\\-]*,

I used this to figure it out: https://regex101.com/r/fOEzd9/1

I think the main problem was the numbers makes \\w not match as a word. You also need to account for the dashes.

Answer 2

我遇到了同样的问题，并使用以下字符串解决了问题：

"(\\w+?)(:|<|>)(\\w+?),"