java 匹配“|”的正则表达式
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Regular Expression to Match " | "
提问by Jorge Israel Pe?a
Hey guys, I am trying to use Java's useDelimitermethod on it's Scannerclass to do some simple parsing. Basically each line is a record delimited by " | ", so for example:
嘿伙计们，我试图useDelimiter在它的Scanner类上使用 Java 的方法来做一些简单的解析。基本上每一行都是一个由“|”分隔的记录，例如：
2 | John Doe
3 | Jane Doe
4 | Hymanie Chan
The method takes as a parameter a regular expression for which to match for. Can someone please provide me with the regular expression that would match |(A vertical bar separated by one space on both sides).
该方法将要匹配的正则表达式作为参数。有人可以为我提供匹配的正则表达式吗|（两边用一个空格分隔的竖线）。
Thanks, I would really appreciate it!
谢谢，我真的很感激！
回答by Jorge Israel Pe?a
I came up with \s\|\swhich in Java would be expressed as "\\s\\|\\s". I don't know if this is the best one though. I don't need anything hardcore, just something that works, and this seems to :)
我想出了\s\|\s在 Java 中将表示为"\\s\\|\\s". 我不知道这是否是最好的。我不需要任何硬核，只需要一些有用的东西，这似乎是:)
Sorry for answering my own question, I guess after typing it out it helped me think.
很抱歉回答我自己的问题，我想在输入后它帮助我思考。
回答by Olivier Croisier
Here is a code snippet that parses a string (or a whole File, Scanner accepts both), and extracts the number and name from each line :
这是一个解析字符串（或整个文件，Scanner 接受两者）并从每一行中提取数字和名称的代码片段：
String s =
"1 | Mr John Doe\n" +
"2 | Ms Jane Doe\n" +
"3 | Hymanie Chan\n";
Pattern pattern = Pattern.compile("(\d+) \| ((\w|\s)+)");
Scanner scan = new Scanner(s);
while (scan.findInLine(pattern) != null) {
MatchResult match = scan.match();
// Do whatever appropriate with the results
System.out.printf("N° %d is %s %n", Integer.valueOf(match.group(1)), match.group(2));
if (scan.hasNextLine()) {
scan.nextLine();
}
}
This code snippet produces the following result :
此代码片段产生以下结果：
N° 1 is Mr John Doe
N° 2 is Ms Jane Doe
N° 3 is Hymanie Chan
回答by adhanlon
" \| "
would work, you need to escape quotes and the |
会工作，你需要转义引号和 |
回答by Fadrian Sudaman
Dont forget to include the * to match repeating character
不要忘记包含 * 以匹配重复字符
\S*\s*\|\s*[\S\t ]*
Edited --
You can use simply this too .*\|.*
已编辑-您也可以简单地使用它 .*\|.*
回答by Sarfraz
......
......
^[ \| ]?$
