Home Java javaTutorial Using regular expressions to extract the contents of ( ) in java

Using regular expressions to extract the contents of ( ) in java

May 21, 2017 pm 02:25 PM
java regular expression

本篇文章,小编为大家介绍关于java中 利用正则表达式提取( )内内容,有需要的朋友可以参考一下

昨天遇到一个小问题,需要批量处理一些用户,而前台传来的用户格式如下,要提取括号中间的内容(不带括号)

教师10(0010)
教师11(0011)
教师9(009)
教师12(0012)
教师13(0013)
教师14(0014)
  
本来想用java的String.split()和substring()来搞定,但是需要处理多次比较麻烦,就用正则表达式了。虽然语法忘得差不多了,但是印象中用断言比较方便(关键希望结果不带括号)。打开RegexBuddy试了下,轻松搞定:

下边是java实现代码:

代码如下:

public List<String> getTeacherList(String managers){
        List<String> ls=new ArrayList<String>();
        Pattern pattern = Pattern.compile("(?<=\\()(.+?)(?=\\))");
        Matcher matcher = pattern.matcher(managers);
        while(matcher.find())
            ls.add(matcher.group());
        return ls;
    }
Copy after login

最后附一下用到的零宽断言:

宽断言 (?=exp) 匹配exp前面的位置
(?<=exp) 匹配exp后面的位置
(?!exp) 匹配后面跟的不是exp的位置
(? 匹配前面不是exp的位置

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