/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String str = "<13>Jan 09 12:33:50 TESTSRV1 AgentDevice=WindowsLog    AgentLogFile=Security    PluginVersion=7.2.4.86    Source=Microsoft-Windows-Security-Auditing    Computer=corp.devnet.com    OriginatingComputer=TESTSRV1    User=    Domain=    EventID=4755    EventIDCode=4755    EventType=8    EventCategory=13826    RecordNumber=1244048130    TimeGenerated=1483983229    TimeWritten=1483983229    Level=0    Keywords=0    Task=0    Opcode=0    Message=A security-enabled universal group was changed.  Subject:  Security ID:  CORP\\TESTUSR1  Account Name:  TESTUSR1  Account Domain:  CORP  Logon ID:  0x220f7a57  Group:  Security ID:  CORP\\Virtual Users  Group Name:  VirtualUsers  Group Domain:  CORP  Changed Attributes:  SAM Account Name: -  SID History:  -  Additional Information:  Privileges:  -";
    	Pattern ptrn = Pattern.compile("Group:\\s+Security\\s+ID:\\s+[^\\\\]*\\\\(.+?)\\s+(?:Account|Group)\\s+Name:");
    	Matcher matcher = ptrn.matcher(str);
    	while (matcher.find()) {
    		System.out.println(matcher.group(1));
    	}
	}
}

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