从一段文本提取IP地址

IP的正则表达式

((?:(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))\.){3}(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d))))

//根据正则表达式，从文本中提取出匹配的字段
        public static List<String> extractString(String text,String regularExpression,String separator){
                String[] wordsArr = text.split(separator);
                List<String> extractList = new ArrayList<>();
                Pattern pattern = Pattern.compile(regularExpression);
                for (String s : wordsArr) {
                        Matcher matcher = pattern.matcher(s);
                        if (matcher.matches()) {
                                extractList.add(s);
                        }
                }
                return extractList;
        }

调用

            String separator = "\t|\n";
            //((?:(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))\.){3}(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d))))
            String regularExpression = "((?:(?:25[0-5]|2[0-4]\\d|((1\\d{2})|([1-9]?\\d)))\\.){3}(?:25[0-5]|2[0-4]\\d|((1\\d{2})|([1-9]?\\d))))";
            String text = "172.20.71.33\t\n172.20.71.32\t\n172.20.71.31\t\n172.20.71.13\t\n172.20.71.14\t\n";

            List<String> l = extractString(text,regularExpression,separator);