合并两个正则表达式

Question

我有两个正则表达式,一个从csv字符串中提取用户名,另一个从中提取电子邮件.

字符串格式是这样的:

String s = "name lastname (username) <mail@mail.something.dk>; name lastname (username) <mail@mail.something.dk>; name lastname (username) <mail@mail.something.dk>";

我的正则表达式的代码是这样的.

Pattern pattern = Pattern.compile("(?<=\\()[^\\)]+");
Matcher matcher = pattern.matcher(s);
Pattern pattern2 = Pattern.compile("((?<=<)[^>]+)");
Matcher matcher2 = pattern2.matcher(s);

while (matcher.find() && matcher2.find()) {
    System.out.println(matcher.group() + " " + matcher2.group());
}

我找到了几个关于合并正则表达式的问题,但是从答案中我还没弄清楚如何合并我的.

我的打印输出显示:

"username mail@mail.com"

我可以使用一个正则表达式从单个匹配器打印出相同的内容吗？

obs:这是一项学校作业,这意味着我"不需要"将它们合并或做更多,但我想知道它是否可能,以及它有多难.

Answer 1

您可以Pipe (|)在您之间使用multiple Regex,以匹配所有这些: -

    String s = "name lastname (username) <mail@mail.something.dk>; name lastname
            (username) <mail@mail.something.dk>; name lastname 
            (username) <mail@mail.something.dk>;";

    // Matches (?<=\\()[^\\)]+  or  ((?<=<)[^>]+)
    Pattern pattern = Pattern.compile("(?<=\\()[^\\)]+|((?<=<)[^>]+)");
    Matcher matcher = pattern.matcher(s);

    while (matcher.find()) {
        System.out.println(matcher.group());
    }

输出: -

username
mail@mail.something.dk
username
mail@mail.something.dk
username
mail@mail.something.dk

更新: -

如果你想打印username,email只有当它们都存在时,你需要拆开你的字符串;,然后在每个字符串上应用下面的Regex.

这是代码: -

    String s = "name lastname (username) ; 
                name lastname (username) <mail@mail.something.dk>; 
                name lastname (username) <mail@mail.something.dk>;";

    String [] strArr = s.split(";");

    for (String str: strArr) {

        Pattern pattern = Pattern.compile("\\(([^\\)]+)(?:\\))\\s(?:\\<)((?<=<)[^>]+)");
        Matcher matcher = pattern.matcher(str);

        while (matcher.find()) {
            System.out.print(matcher.group(1) + " " + matcher.group(2));
        }
        System.out.println();
    }

输出: -

username mail@mail.something.dk
username mail@mail.something.dk // Only the last two have both username and email