diff --git a/src/wp-includes/shortcodes.php b/src/wp-includes/shortcodes.php
index 728ec26484..465293d9f9 100644
--- a/src/wp-includes/shortcodes.php
+++ b/src/wp-includes/shortcodes.php
@@ -488,9 +488,8 @@ function get_shortcode_atts_regex() {
  * retrieval of the attributes, since all attributes have to be known.
  *
  * @since 2.5.0
- * @since 5.3.0 Added support of a full shortcode input.
  *
- * @param string $text Any single shortcode of any format or key/value pair string.
+ * @param string $text
  * @return array|string List of attribute values.
  *                      Returns empty array if trim( $text ) == '""'.
  *                      Returns empty string if trim( $text ) == ''.
@@ -499,13 +498,7 @@ function get_shortcode_atts_regex() {
 function shortcode_parse_atts( $text ) {
 	$atts    = array();
 	$pattern = get_shortcode_atts_regex();
-	$text    = trim( preg_replace( "/[\x{00a0}\x{200b}]+/u", ' ', $text ) );
-
-	// Remove everything but attributes from shortcode.
-	if ( preg_match( '#^\[[\w-]+([^\]]*?)\/?\]#', $text, $matches ) ) {
-		$text = $matches[1];
-	}
-
+	$text    = preg_replace( "/[\x{00a0}\x{200b}]+/u", ' ', $text );
 	if ( preg_match_all( $pattern, $text, $match, PREG_SET_ORDER ) ) {
 		foreach ( $match as $m ) {
 			if ( ! empty( $m[1] ) ) {
diff --git a/tests/phpunit/tests/shortcode.php b/tests/phpunit/tests/shortcode.php
index b836a590cc..a978779c9a 100644
--- a/tests/phpunit/tests/shortcode.php
+++ b/tests/phpunit/tests/shortcode.php
@@ -740,7 +740,7 @@ EOF;
 	}
 
 	function data_whole_posts() {
-		require_once DIR_TESTDATA . '/formatting/whole-posts.php';
+		require_once( DIR_TESTDATA . '/formatting/whole-posts.php' );
 		return data_whole_posts();
 	}
 
@@ -972,136 +972,4 @@ EOF;
 		);
 		$this->assertEquals( 'test-shortcode-tag', $this->tagname );
 	}
-
-	/**
-	 * Testing the `shortcode_parse_atts()` function.
-	 *
-	 * @ticket 47863
-	 *
-	 * @covers ::shortcode_parse_atts
-	 * @dataProvider data_shortcode_parse_atts
-	 *
-	 * @param string       $text     A single shortcode format or key/value pair string.
-	 * @param string|array $expected Expected results.
-	 */
-	public function test_shortcode_parse_atts( $text, $expected ) {
-		$actual = shortcode_parse_atts( $text );
-		$this->assertSame( $expected, $actual );
-	}
-
-	/**
-	 * Data provider for `test_shortcode_parse_atts()`.
-	 *
-	 * @return array {
-	 *     @type array {
-	 *         @type string       $text     A single shortcode format or key/value pair string.
-	 *         @type string|array $expected The expected result.
-	 *     }
-	 * }
-	 */
-	public function data_shortcode_parse_atts() {
-
-		return array(
-			array(
-				'',
-				'',
-			),
-			array(
-				'	',
-				'',
-			),
-			array(
-				'""',
-				array(),
-			),
-			array(
-				'\'\'',
-				array(),
-			),
-			array(
-				'[unittest]',
-				'',
-			),
-			array(
-				'[unitest]Unit Test[/unittest]',
-				'',
-			),
-			array(
-				'[unittest title="unittest" link="https://unit.test/"]',
-				array(
-					'title' => 'unittest',
-					'link'  => 'https://unit.test/',
-				),
-			),
-			array(
-				'[unittest title="unittest" link="https://unit.test/"/]',
-				array(
-					'title' => 'unittest',
-					'link'  => 'https://unit.test/',
-				),
-			),
-			array(
-				'[unit_test title="unittest" link="https://unit.test/"/]',
-				array(
-					'title' => 'unittest',
-					'link'  => 'https://unit.test/',
-				),
-			),
-			array(
-				'[unit-test title="unittest" link="https://unit.test/"/]',
-				array(
-					'title' => 'unittest',
-					'link'  => 'https://unit.test/',
-				),
-			),
-			array(
-				'[unittest link=https://unit.test/ /]',
-				array(
-					'link' => 'https://unit.test/',
-				),
-			),
-			array(
-				'[unittest link=https://unit.test/ ]',
-				array(
-					'link' => 'https://unit.test/',
-				),
-			),
-			array(
-				'[unittest link=https://unit.test/]',
-				array(
-					'link' => 'https://unit.test',
-				),
-			),
-			array(
-				'[unittest link https://unit.test/ /]',
-				array(
-					'link',
-					'https://unit.test/',
-				),
-			),
-			array(
-				'[unittest title="unittest" link="https://unit.test/"]Unit Test[/unittest]',
-				array(
-					'title' => 'unittest',
-					'link'  => 'https://unit.test/',
-				),
-			),
-			array(
-				'[unittest title="unittest" link="https://unit.test/"][unit_test foo="bar" bar="foo"][/unittest]',
-				array(
-					'title' => 'unittest',
-					'link'  => 'https://unit.test/',
-				),
-			),
-			array(
-				'title="unittest" link="https://unit.test/"',
-				array(
-					'title' => 'unittest',
-					'link'  => 'https://unit.test/',
-				),
-			),
-		);
-
-	}
-
 }