/* 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 text = "Keep this.\nAnd keep this.\n\nAnd keep this too.\n"
        + "Chomp this chomp:\nAnything beyond here gets chomped.";
		Pattern CHOMP= Pattern.compile("^(.*)chomp:(.*)",  Pattern.MULTILINE);
		Matcher m = CHOMP.matcher(text);
		if (m.find()) {
			System.out.println("  LINE:" + m.group(0));
			System.out.println("BEFORE:" + m.group(1));
			System.out.println(" AFTER:" + m.group(2));
			System.out.println(">>>");
			StringBuffer sb = new StringBuffer();
			m.appendReplacement(sb, "");
			System.out.print(sb);
			System.out.println("<<<");
		}
	}
}

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