正则表达式可在管道之间分割（括号中除外）

Question

I have the following text line:

|random|[abc|www.abc.org]|1024|

I would like to split these into 3 parts with a regular expression

random
[abc|www.abc.org]
1024

Currently the following result is achieved with expression \\|

random
[abc
www.abc.org]
1024

My problem is that I cannot exclude the pipe symbol in the middle column surrounded by the brackets [].

Answer 1

If you have to use split , you can use the regex

\|(?=$|[^]]+\||\[[^]]+\]\|)

https://regex101.com/r/7OxmiY/1

It will match a pipe, then lookahead for either:

$ , the end of the string, so that the final | is split on, or

[^]]+\\| , non- ] characters until a pipe is reached, ensuring that pipes inside [] s will not be split upon, or

\\[[^]]+\\]\\| - Same as above, except with literal [ and ] s surrounding the pattern

In Java:

String input = "|random|[abc|www.abc.org]|[test]|1024|";
String[] output = input.split("\\|(?=$|[^]]+\\|)"); 

Answer 2

You can use follow code:

final String regex = "(?<=|)\\[?[\\w.]+\\|?[\\w.]+\\]?(?=|)";
final String string = "|random|[abc|www.abc.org]|[test]|1024|";

final Pattern pattern = Pattern.compile(regex);
final Matcher matcher = pattern.matcher(string);

while (matcher.find()) {
    System.out.println("Full match: " + matcher.group(0));
}

Output:

Full match: random
Full match: [abc|www.abc.org]
Full match: [test]
Full match: 1024

See here at regex101: https://regex101.com/r/Fcb3Wx/1