import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String s = "| 2021-08-18 01:28 | Twitter | [INTL TWITTER AAA BBB CC ] (https://t...content-available-to-author-only...a.com/#/groups/123) | Twitter XX (C++, C#) | 1 | 2 | 3 | 4 | [ aaaa ] | 5 | 6 | 7 |";
		Pattern pattern = Pattern.compile("\\|\\s*(\\d+)(?=\\s*\\|)");
		Matcher matcher = pattern.matcher(s);
		while (matcher.find()){
			System.out.println(matcher.group(1)); 
		} 
	}
}

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