diff --git a/packages/ckeditor5-font/src/fontsize/fontsizeediting.js b/packages/ckeditor5-font/src/fontsize/fontsizeediting.js
index cd91d98092c..94003b0fde8 100644
--- a/packages/ckeditor5-font/src/fontsize/fontsizeediting.js
+++ b/packages/ckeditor5-font/src/fontsize/fontsizeediting.js
@@ -9,6 +9,7 @@
 
 import { Plugin } from 'ckeditor5/src/core';
 import { CKEditorError } from 'ckeditor5/src/utils';
+import { isLength, isPercentage } from 'ckeditor5/src/engine';
 
 import FontSizeCommand from './fontsizecommand';
 import { normalizeOptions } from './utils';
@@ -109,7 +110,9 @@ export default class FontSizeEditing extends Plugin {
 		const editor = this.editor;
 
 		// If `fontSize.supportAllValues=true`, we do not allow to use named presets in the plugin's configuration.
-		const presets = definition.model.values.filter( value => !String( value ).match( /[\d.][\w%]+/ ) );
+		const presets = definition.model.values.filter( value => {
+			return !isLength( String( value ) ) && !isPercentage( String( value ) );
+		} );
 
 		if ( presets.length ) {
 			/**
diff --git a/packages/ckeditor5-font/tests/fontsize/fontsizeediting.js b/packages/ckeditor5-font/tests/fontsize/fontsizeediting.js
index e2e37f03b02..4a7b310808e 100644
--- a/packages/ckeditor5-font/tests/fontsize/fontsizeediting.js
+++ b/packages/ckeditor5-font/tests/fontsize/fontsizeediting.js
@@ -76,7 +76,7 @@ describe( 'FontSizeEditing', () => {
 								'10px',
 								12,
 								{
-									model: 14,
+									model: '14px',
 									title: '14px'
 								}
 							]
diff --git a/packages/ckeditor5-link/src/autolink.js b/packages/ckeditor5-link/src/autolink.js
index 6c8d5a25871..5032ebbfb7e 100644
--- a/packages/ckeditor5-link/src/autolink.js
+++ b/packages/ckeditor5-link/src/autolink.js
@@ -40,7 +40,7 @@ const URL_REG_EXP = new RegExp(
 					// Do not allow `www.foo` - see https://github.com/ckeditor/ckeditor5/issues/8050.
 					'((?!www\\.)|(www\\.))' +
 					// Host & domain names.
-					'(?![-_])(?:[-\\w\\u00a1-\\uffff]{0,63}[^-_]\\.)+' +
+					'(?![-_])(?:[-_a-z0-9\\u00a1-\\uffff]{1,63}[a-z0-9\\u00a1-\\uffff]\\.)+' +
 					// TLD identifier name.
 					'(?:[a-z\\u00a1-\\uffff]{2,})' +
 				')' +
diff --git a/packages/ckeditor5-media-embed/src/automediaembed.js b/packages/ckeditor5-media-embed/src/automediaembed.js
index b523ebca5fd..d9ceca358c3 100644
--- a/packages/ckeditor5-media-embed/src/automediaembed.js
+++ b/packages/ckeditor5-media-embed/src/automediaembed.js
@@ -16,7 +16,7 @@ import { global } from 'ckeditor5/src/utils';
 import MediaEmbedEditing from './mediaembedediting';
 import { insertMedia } from './utils';
 
-const URL_REGEXP = /^(?:http(s)?:\/\/)?[\w.-][\w-.~:/?#[\]@!$&'()*+,;=%]+$/;
+const URL_REGEXP = /^(?:http(s)?:\/\/)?[\w-]+\.[\w-.~:/?#[\]@!$&'()*+,;=%]+$/;
 
 /**
  * The auto-media embed plugin. It recognizes media links in the pasted content and embeds