diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/filter/ParseConstants.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/filter/ParseConstants.java
index b9132a3ba29..9f52783dbb0 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/filter/ParseConstants.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/filter/ParseConstants.java
@@ -244,13 +244,6 @@ public final class ParseConstants {
   public static final byte [] regexStringType = new byte [] {'r','e','g','e', 'x',
                                                              's','t','r','i','n','g'};
 
-  /**
-   * RegexStringNoCaseType byte array
-   */
-  public static final byte [] regexStringNoCaseType = new byte [] {'r','e','g','e','x',
-                                                                   's','t','r','i','n','g',
-                                                                   'n','o','c','a','s','e'};
-
   /**
    * SubstringType byte array
    */
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/filter/ParseFilter.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/filter/ParseFilter.java
index e06c6b5c413..1aeaa13f5a9 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/filter/ParseFilter.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/filter/ParseFilter.java
@@ -28,7 +28,6 @@ import java.util.Collections;
 import java.util.EmptyStackException;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.regex.Pattern;
 import java.util.Set;
 import java.util.Stack;
 
@@ -813,9 +812,6 @@ public class ParseFilter {
       return new BinaryPrefixComparator(comparatorValue);
     else if (Bytes.equals(comparatorType, ParseConstants.regexStringType))
       return new RegexStringComparator(new String(comparatorValue, StandardCharsets.UTF_8));
-    else if (Bytes.equals(comparatorType, ParseConstants.regexStringNoCaseType))
-      return new RegexStringComparator(new String(comparatorValue, StandardCharsets.UTF_8),
-                                       Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
     else if (Bytes.equals(comparatorType, ParseConstants.substringType))
       return new SubstringComparator(new String(comparatorValue, StandardCharsets.UTF_8));
     else
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/filter/TestParseFilter.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/filter/TestParseFilter.java
index fbedc1c0e68..8dd15be6fc6 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/filter/TestParseFilter.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/filter/TestParseFilter.java
@@ -24,7 +24,6 @@ import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.regex.Pattern;
 import org.apache.hadoop.hbase.CompareOperator;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
@@ -280,20 +279,6 @@ public class TestParseFilter {
     assertEquals("pre*", new String(regexStringComparator.getValue(), StandardCharsets.UTF_8));
   }
 
-  @Test
-  public void testQualifierFilterNoCase() throws IOException {
-    String filterString = "QualifierFilter(=, 'regexstringnocase:pre*')";
-    QualifierFilter qualifierFilter =
-      doTestFilter(filterString, QualifierFilter.class);
-    assertEquals(CompareOperator.EQUAL, qualifierFilter.getCompareOperator());
-    assertTrue(qualifierFilter.getComparator() instanceof RegexStringComparator);
-    RegexStringComparator regexStringComparator =
-      (RegexStringComparator) qualifierFilter.getComparator();
-    assertEquals("pre*", new String(regexStringComparator.getValue(), StandardCharsets.UTF_8));
-    int regexComparatorFlags = regexStringComparator.getEngine().getFlags();
-    assertEquals(Pattern.CASE_INSENSITIVE | Pattern.DOTALL, regexComparatorFlags);
-  }
-
   @Test
   public void testValueFilter() throws IOException {
     String filterString = "ValueFilter(!=, 'substring:pre')";