If you have worked with flat files String.split should have been useful to you. One inconsistency, I found is change in behavior on cause of empty strings appeared in file with operator(",") and without separator.

SplitTest.java

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import java.util.Arrays;

import org.apache.commons.lang3.StringUtils;
import org.junit.Test;

public class SplitTest {

    @Test
    public void inconsistancyIObserved() throws Exception {

        assertTrue("".split(",").length == 1);
        assertTrue(",".split(",").length == 0);
        assertTrue(",,".split(",").length == 0);
    }
  
      @Test
    public void expectedConsistency() throws Exception {
        assertTrue(Arrays.stream("".split(",")).filter(StringUtils::isNotBlank).toArray(String[]::new).length == 0);
        assertTrue(Arrays.stream(",".split(",")).filter(StringUtils::isNotBlank).toArray(String[]::new).length == 0);
        assertTrue(Arrays.stream(",,".split(",")).filter(StringUtils::isNotBlank).toArray(String[]::new).length == 0);

    }
}