合并两个正则表达式 [英] merge two regular expressions

问题描述

我有两个正则表达式，一个从csv字符串中取出用户名，另一个用来取出电子邮件。

I have two regular expressions, one pulling out usernames from a csv string, and the other pulling out emails.

字符串格式如下：

String s = "name lastname (username) <[e-mail]>; name lastname (username) <[e-mail]>; name lastname (username) <[e-mail]>";

我的正则表达式的代码是这样的。

the code for my regular expressions are like this.

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());
}

我发现了几个关于合并正则表达式的问题，但是从我的答案中我找到了我能够弄清楚如何合并我的。

I've found several qeustions about merging regexes, but from the answers i haven't been able to figure out how to merge mine.

我的打印输出显示：

"username [e-mail]"

我可以使用一个正则表达式从单个匹配器打印出相同的？

would I be able to print out the same from a single matcher, using one regex?

obs：这是一个学校作业，这意味着我不要需要合并它们或做更多，但我想知道它是否可能，以及它有多难。

obs: this is a school assignment, which means i do not "need" to merge them or do any more, but i'd like to know if it is possible, and how difficult it would be.

推荐答案

你可以在你的多个正则表达式之间使用 Pipe（|）来匹配所有这些： -

You can just use an Pipe (|) in between your multiple Regex, to match all of them : -

    String s = "name lastname (username) <[e-mail]>; name lastname
            (username) <[e-mail]>; name lastname 
            (username) <[e-mail]>;";

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

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

输出： -

username
[e-mail]
username
[e-mail]
username
[e-mail]

UPDATE ： -

如果您想打印用户名和电子邮件只有当它们都存在时，你需要在; 上拆分你的字符串，然后在每个字符串上应用下面的Regex。

If you want to print username and email only when they both exists, then you need to split your string on ; and then apply the below Regex on each of them.

以下是代码： -

    String s = "name lastname (username) ; 
                name lastname (username) <[e-mail]>; 
                name lastname (username) <[e-mail]>;";

    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 [e-mail]
username [e-mail] // Only the last two have both username and email

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