Pattern pattern = Pattern.compile("^人数\\((\\d)+\\)");
        Matcher matcher = pattern.matcher("人数(2345)asdfasdf");
        if(matcher.find()) {
            System.out.println(matcher.group().replaceAll("(\\D)", ""));
        }

------解决方案--------------------
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Java code

        Pattern pattern = Pattern.compile("^人数\\((\\d)+\\)");
        Matcher matcher = pattern.matcher("人数(2345)asdfasdf");
        if(matcher.find()) {
            System.out.println(ma……


------解决方案--------------------
Java code
^人数\\((^[1-9]\\d*)+\\)