Add Add org.apache.commons.lang3.StringUtils.substringAfterLast(String,

int).

src/changes/changes.xml

@@ -83,6 +83,7 @@ The <action> type attribute can be add,update,fix,remove.
     <action issue="LANG-1542" type="update" dev="ggregory" due-to=" Trần Ngọc Khoa, Gary Gregory">ToStringBuilder.reflectionToString - Wrong JSON format when object has a List of Enum.</action>
     <action                   type="update" dev="ggregory">Make org.apache.commons.lang3.CharSequenceUtils.toCharArray(CharSequence) public.</action>
     <action                   type="add" dev="ggregory">Add org.apache.commons.lang3.StringUtils.substringAfter(String, int).</action>
+    <action                   type="add" dev="ggregory">Add org.apache.commons.lang3.StringUtils.substringAfterLast(String, int).</action>
     <action                   type="update" dev="ggregory">org.apache.commons:commons-parent 50 -> 51.</action>
     <action                   type="update" dev="ggregory">org.junit-pioneer:junit-pioneer 0.5.4 -> 0.6.0.</action>
     <action                   type="update" dev="ggregory">org.junit.jupiter:junit-jupiter 5.6.0 -> 5.6.1.</action>

src/main/java/org/apache/commons/lang3/StringUtils.java

@@ -8672,6 +8672,43 @@ public static String substringAfterLast(final String str, final String separator
         return str.substring(pos + separator.length());
     }
 
+    /**
+     * <p>Gets the substring after the last occurrence of a separator.
+     * The separator is not returned.</p>
+     *
+     * <p>A {@code null} string input will return {@code null}.
+     * An empty ("") string input will return the empty string.
+     *
+     * <p>If nothing is found, the empty string is returned.</p>
+     *
+     * <pre>
+     * StringUtils.substringAfterLast(null, *)      = null
+     * StringUtils.substringAfterLast("", *)        = ""
+     * StringUtils.substringAfterLast("abc", 'a')   = "bc"
+     * StringUtils.substringAfterLast(" bc", 32)    = "bc"
+     * StringUtils.substringAfterLast("abcba", 'b') = "a"
+     * StringUtils.substringAfterLast("abc", 'c')   = ""
+     * StringUtils.substringAfterLast("a", 'a')     = ""
+     * StringUtils.substringAfterLast("a", 'z')     = ""
+     * </pre>
+     *
+     * @param str  the String to get a substring from, may be null
+     * @param separator  the String to search for, may be null
+     * @return the substring after the last occurrence of the separator,
+     *  {@code null} if null String input
+     * @since 3.11
+     */
+    public static String substringAfterLast(final String str, final int separator) {
+        if (isEmpty(str)) {
+            return str;
+        }
+        final int pos = str.lastIndexOf(separator);
+        if (pos == INDEX_NOT_FOUND || pos == str.length() - 1) {
+            return EMPTY;
+        }
+        return str.substring(pos + 1);
+    }
+
     // SubStringAfter/SubStringBefore
     //-----------------------------------------------------------------------
     /**

src/test/java/org/apache/commons/lang3/StringUtilsSubstringTest.java

@@ -228,6 +228,22 @@ public void testSubstringAfterLast_StringString() {
         assertEquals("", StringUtils.substringAfterLast("abc", ""));
     }
 
+    @Test
+    public void testSubstringAfterLast_StringInt() {
+        assertNull(StringUtils.substringAfterLast(null, 0));
+        assertNull(StringUtils.substringAfterLast(null, 'X'));
+        assertEquals("", StringUtils.substringAfterLast("", 0));
+        assertEquals("", StringUtils.substringAfterLast("", 'a'));
+
+        assertEquals("", StringUtils.substringAfterLast("foo", 0));
+        assertEquals("", StringUtils.substringAfterLast("foo", 'b'));
+        assertEquals("t", StringUtils.substringAfterLast("foot", 'o'));
+        assertEquals("bc", StringUtils.substringAfterLast("abc", 'a'));
+        assertEquals("a", StringUtils.substringAfterLast("abcba", 'b'));
+        assertEquals("", StringUtils.substringAfterLast("abc", 'c'));
+        assertEquals("", StringUtils.substringAfterLast("", 'd'));
+    }
+
     //-----------------------------------------------------------------------
     @Test
     public void testSubstringBetween_StringString() {