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diff --git a/wp-includes/js/tinymce/plugins/wptextpattern/plugin.js b/wp-includes/js/tinymce/plugins/wptextpattern/plugin.js
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+/**
+ * Text pattern plugin for TinyMCE
+ *
+ * @since 4.3.0
+ *
+ * This plugin can automatically format text patterns as you type. It includes several groups of patterns.
+ *
+ * Start of line patterns:
+ *  As-you-type:
+ *  - Unordered list (`* ` and `- `).
+ *  - Ordered list (`1. ` and `1) `).
+ *
+ *  On enter:
+ *  - h2 (## ).
+ *  - h3 (### ).
+ *  - h4 (#### ).
+ *  - h5 (##### ).
+ *  - h6 (###### ).
+ *  - blockquote (> ).
+ *  - hr (---).
+ *
+ * Inline patterns:
+ *  - <code> (`) (backtick).
+ *
+ * If the transformation in unwanted, the user can undo the change by pressing backspace,
+ * using the undo shortcut, or the undo button in the toolbar.
+ *
+ * Setting for the patterns can be overridden by plugins by using the `tiny_mce_before_init` PHP filter.
+ * The setting name is `wptextpattern` and the value is an object containing override arrays for each
+ * patterns group. There are three groups: "space", "enter", and "inline". Example (PHP):
+ *
+ * add_filter( 'tiny_mce_before_init', 'my_mce_init_wptextpattern' );
+ * function my_mce_init_wptextpattern( $init ) {
+ *   $init['wptextpattern'] = wp_json_encode( array(
+ *      'inline' => array(
+ *        array( 'delimiter' => '**', 'format' => 'bold' ),
+ *        array( 'delimiter' => '__', 'format' => 'italic' ),
+ *      ),
+ *   ) );
+ *
+ *   return $init;
+ * }
+ *
+ * Note that setting this will override the default text patterns. You will need to include them
+ * in your settings array if you want to keep them working.
+ */
+( function( tinymce, setTimeout ) {
+	if ( tinymce.Env.ie && tinymce.Env.ie < 9 ) {
+		return;
+	}
+
+	/**
+	 * Escapes characters for use in a Regular Expression.
+	 *
+	 * @param {String} string Characters to escape
+	 *
+	 * @return {String} Escaped characters
+	 */
+	function escapeRegExp( string ) {
+		return string.replace( /[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, '\\$&' );
+	}
+
+	tinymce.PluginManager.add( 'wptextpattern', function( editor ) {
+		var VK = tinymce.util.VK;
+		var settings = editor.settings.wptextpattern || {};
+
+		var spacePatterns = settings.space || [
+			{ regExp: /^[*-]\s/, cmd: 'InsertUnorderedList' },
+			{ regExp: /^1[.)]\s/, cmd: 'InsertOrderedList' }
+		];
+
+		var enterPatterns = settings.enter || [
+			{ start: '##', format: 'h2' },
+			{ start: '###', format: 'h3' },
+			{ start: '####', format: 'h4' },
+			{ start: '#####', format: 'h5' },
+			{ start: '######', format: 'h6' },
+			{ start: '>', format: 'blockquote' },
+			{ regExp: /^(-){3,}$/, element: 'hr' }
+		];
+
+		var inlinePatterns = settings.inline || [
+			{ delimiter: '`', format: 'code' }
+		];
+
+		var canUndo;
+
+		editor.on( 'selectionchange', function() {
+			canUndo = null;
+		} );
+
+		editor.on( 'keydown', function( event ) {
+			if ( ( canUndo && event.keyCode === 27 /* ESCAPE */ ) || ( canUndo === 'space' && event.keyCode === VK.BACKSPACE ) ) {
+				editor.undoManager.undo();
+				event.preventDefault();
+				event.stopImmediatePropagation();
+			}
+
+			if ( VK.metaKeyPressed( event ) ) {
+				return;
+			}
+
+			if ( event.keyCode === VK.ENTER ) {
+				enter();
+			// Wait for the browser to insert the character.
+			} else if ( event.keyCode === VK.SPACEBAR ) {
+				setTimeout( space );
+			} else if ( event.keyCode > 47 && ! ( event.keyCode >= 91 && event.keyCode <= 93 ) ) {
+				setTimeout( inline );
+			}
+		}, true );
+
+		function inline() {
+			var rng = editor.selection.getRng();
+			var node = rng.startContainer;
+			var offset = rng.startOffset;
+			var startOffset;
+			var endOffset;
+			var pattern;
+			var format;
+			var zero;
+
+			// We need a non-empty text node with an offset greater than zero.
+			if ( ! node || node.nodeType !== 3 || ! node.data.length || ! offset ) {
+				return;
+			}
+
+			var string = node.data.slice( 0, offset );
+			var lastChar = node.data.charAt( offset - 1 );
+
+			tinymce.each( inlinePatterns, function( p ) {
+				// Character before selection should be delimiter.
+				if ( lastChar !== p.delimiter.slice( -1 ) ) {
+					return;
+				}
+
+				var escDelimiter = escapeRegExp( p.delimiter );
+				var delimiterFirstChar = p.delimiter.charAt( 0 );
+				var regExp = new RegExp( '(.*)' + escDelimiter + '.+' + escDelimiter + '$' );
+				var match = string.match( regExp );
+
+				if ( ! match ) {
+					return;
+				}
+
+				startOffset = match[1].length;
+				endOffset = offset - p.delimiter.length;
+
+				var before = string.charAt( startOffset - 1 );
+				var after = string.charAt( startOffset + p.delimiter.length );
+
+				// test*test*  => format applied.
+				// test *test* => applied.
+				// test* test* => not applied.
+				if ( startOffset && /\S/.test( before ) ) {
+					if ( /\s/.test( after ) || before === delimiterFirstChar ) {
+						return;
+					}
+				}
+
+				// Do not replace when only whitespace and delimiter characters.
+				if ( ( new RegExp( '^[\\s' + escapeRegExp( delimiterFirstChar ) + ']+$' ) ).test( string.slice( startOffset, endOffset ) ) ) {
+					return;
+				}
+
+				pattern = p;
+
+				return false;
+			} );
+
+			if ( ! pattern ) {
+				return;
+			}
+
+			format = editor.formatter.get( pattern.format );
+
+			if ( format && format[0].inline ) {
+				editor.undoManager.add();
+
+				editor.undoManager.transact( function() {
+					node.insertData( offset, '\uFEFF' );
+
+					node = node.splitText( startOffset );
+					zero = node.splitText( offset - startOffset );
+
+					node.deleteData( 0, pattern.delimiter.length );
+					node.deleteData( node.data.length - pattern.delimiter.length, pattern.delimiter.length );
+
+					editor.formatter.apply( pattern.format, {}, node );
+
+					editor.selection.setCursorLocation( zero, 1 );
+				} );
+
+				// We need to wait for native events to be triggered.
+				setTimeout( function() {
+					canUndo = 'space';
+
+					editor.once( 'selectionchange', function() {
+						var offset;
+
+						if ( zero ) {
+							offset = zero.data.indexOf( '\uFEFF' );
+
+							if ( offset !== -1 ) {
+								zero.deleteData( offset, offset + 1 );
+							}
+						}
+					} );
+				} );
+			}
+		}
+
+		function firstTextNode( node ) {
+			var parent = editor.dom.getParent( node, 'p' ),
+				child;
+
+			if ( ! parent ) {
+				return;
+			}
+
+			while ( child = parent.firstChild ) {
+				if ( child.nodeType !== 3 ) {
+					parent = child;
+				} else {
+					break;
+				}
+			}
+
+			if ( ! child ) {
+				return;
+			}
+
+			if ( ! child.data ) {
+				if ( child.nextSibling && child.nextSibling.nodeType === 3 ) {
+					child = child.nextSibling;
+				} else {
+					child = null;
+				}
+			}
+
+			return child;
+		}
+
+		function space() {
+			var rng = editor.selection.getRng(),
+				node = rng.startContainer,
+				parent,
+				text;
+
+			if ( ! node || firstTextNode( node ) !== node ) {
+				return;
+			}
+
+			parent = node.parentNode;
+			text = node.data;
+
+			tinymce.each( spacePatterns, function( pattern ) {
+				var match = text.match( pattern.regExp );
+
+				if ( ! match || rng.startOffset !== match[0].length ) {
+					return;
+				}
+
+				editor.undoManager.add();
+
+				editor.undoManager.transact( function() {
+					node.deleteData( 0, match[0].length );
+
+					if ( ! parent.innerHTML ) {
+						parent.appendChild( document.createElement( 'br' ) );
+					}
+
+					editor.selection.setCursorLocation( parent );
+					editor.execCommand( pattern.cmd );
+				} );
+
+				// We need to wait for native events to be triggered.
+				setTimeout( function() {
+					canUndo = 'space';
+				} );
+
+				return false;
+			} );
+		}
+
+		function enter() {
+			var rng = editor.selection.getRng(),
+				start = rng.startContainer,
+				node = firstTextNode( start ),
+				i = enterPatterns.length,
+				text, pattern, parent;
+
+			if ( ! node ) {
+				return;
+			}
+
+			text = node.data;
+
+			while ( i-- ) {
+				if ( enterPatterns[ i ].start ) {
+					if ( text.indexOf( enterPatterns[ i ].start ) === 0 ) {
+						pattern = enterPatterns[ i ];
+						break;
+					}
+				} else if ( enterPatterns[ i ].regExp ) {
+					if ( enterPatterns[ i ].regExp.test( text ) ) {
+						pattern = enterPatterns[ i ];
+						break;
+					}
+				}
+			}
+
+			if ( ! pattern ) {
+				return;
+			}
+
+			if ( node === start && tinymce.trim( text ) === pattern.start ) {
+				return;
+			}
+
+			editor.once( 'keyup', function() {
+				editor.undoManager.add();
+
+				editor.undoManager.transact( function() {
+					if ( pattern.format ) {
+						editor.formatter.apply( pattern.format, {}, node );
+						node.replaceData( 0, node.data.length, ltrim( node.data.slice( pattern.start.length ) ) );
+					} else if ( pattern.element ) {
+						parent = node.parentNode && node.parentNode.parentNode;
+
+						if ( parent ) {
+							parent.replaceChild( document.createElement( pattern.element ), node.parentNode );
+						}
+					}
+				} );
+
+				// We need to wait for native events to be triggered.
+				setTimeout( function() {
+					canUndo = 'enter';
+				} );
+			} );
+		}
+
+		function ltrim( text ) {
+			return text ? text.replace( /^\s+/, '' ) : '';
+		}
+	} );
+} )( window.tinymce, window.setTimeout );