如何编写与括号内的某个字符匹配的正则表达式？

Question

So I have a string that's like this,

(name|address)
([name|address])
[name|address]

So I want to check for '|' character and ignore if it's in the brackets like I have shown in the example.

I have added this regex but it's not capturing all scenarios that I have described.

\\|(?![^(]*\\))

Edit:

If I have string like this,

|Hello all, | morning [name|address] |

Then I am breaking the string by |character. But I don't want to consider | character which are inside the brackets while breaking the string.

Answer 1

You can use

import java.util.*;
import java.util.regex.*;

class Test
{
    public static void main (String[] args) throws java.lang.Exception
    {
        String s = "|Hello all, | morning [name|address] |";
        Pattern pattern = Pattern.compile("(?:\\([^()]*\\)|\\[[^\\]\\[]*]|[^|])+");
        Matcher matcher = pattern.matcher(s);
        while (matcher.find()){
            System.out.println(matcher.group().trim()); 
        } 
    }
}

See the regex demo and the Java demo .

Details :

• (?: - start of a non-capturing group:
  • \([^()]*\)| - ( , zero or more chars other than ( and ) , and then a ) char, or
  • \[[^\]\[]*]| - [ , zero or more chars other than a [ or ] char, and then a ] char, or
  • [^|] - any single char other than a pipe char
• )+ - end of the group, repeat one or more times.

Note that in Android, Java, ICU regex flavors, both [ and ] must be escaped inside character classes.