diff -u b/core/misc/message.es6.js b/core/misc/message.es6.js
--- b/core/misc/message.es6.js
+++ b/core/misc/message.es6.js
@@ -99,16 +99,9 @@
         return [];
       }
 
-      const whitespace = /\s+/;
-      const indexes = Array.isArray(index) ? index : [index];
-      // If the index has spaces, add several data matches, the same way
-      const selectors = indexes.map(currentIndex =>
-        // class names work.
-        currentIndex.trim()
-          .split(whitespace)
-          .map(i => `[data-drupal-message-id^="${i}"]`)
-          .join(''),
-      );
+      // Constuct an array of selectors based on the available message index(s).
+      const selectors = (Array.isArray(index) ? index : [index])
+        .map(currentIndex => `[data-drupal-message-id^="${currentIndex}"]`);
 
       return this.messageWrapper.querySelectorAll(selectors.join(','));
     }
@@ -225,7 +218,7 @@
       messageText.innerHTML = messagesTypes[options.type];
     }
 
-    // Alerts have a different HTML structure
+    // Alerts have a different HTML structure.
     if (options.type === 'error') {
       messageText.setAttribute('role', 'alert');
     }
diff -u b/core/misc/message.js b/core/misc/message.js
--- b/core/misc/message.js
+++ b/core/misc/message.js
@@ -49,13 +49,8 @@
           return [];
         }
 
-        var whitespace = /\s+/;
-        var indexes = Array.isArray(index) ? index : [index];
-
-        var selectors = indexes.map(function (currentIndex) {
-          return currentIndex.trim().split(whitespace).map(function (i) {
-            return '[data-drupal-message-id^="' + i + '"]';
-          }).join('');
+        var selectors = (Array.isArray(index) ? index : [index]).map(function (currentIndex) {
+          return '[data-drupal-message-id^="' + currentIndex + '"]';
         });
 
         return this.messageWrapper.querySelectorAll(selectors.join(','));
@@ -139 +134,2 @@
-})(Drupal);
\ No newline at end of file
+})(Drupal);
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If no element is supplied, the default\n   *   selector is used.\n   *\n   * @return {Drupal.message~messageDefinition}\n   *   Object to add and remove messages.\n   */\n\n  Drupal.message = class {\n    constructor(messageWrapper = document.querySelector('[data-drupal-messages]')) {\n      this.messageWrapper = messageWrapper;\n      if (!this.messageWrapper) {\n        throw new Error(Drupal.t('There is no @element on the page.', { '@element': '[data-drupal-messages]' }));\n      }\n    }\n\n    static getMessageTypes() {\n      return {\n        status: Drupal.t('Status message'),\n        error: Drupal.t('Error message'),\n        warning: Drupal.t('Warning message'),\n      };\n    }\n\n    /**\n     * Sequentially adds a message to the message area.\n     *\n     * @name Drupal.message~messageDefinition.add\n     *\n     * @param {string} message\n     *   The message to display\n     * @param {object} [options]\n     *   The context of the message, used for removing messages again.\n     * @param {string} [options.id]\n     *   The message ID, it can be a simple value: `'filevalidationerror'`\n     *   or several values separated by a space: `'mymodule formvalidation'`\n     *   which can be used as a sort of tag for message deletion.\n     * @param {string} [options.type=status]\n     *   Message type, can be either 'status', 'error' or 'warning'.\n     * @param {string} [options.announce]\n     *   Screen-reader version of the message if necessary. To prevent a message\n     *   being sent to Drupal.announce() this should be `''`.\n     * @param {string} [options.priority]\n     *   Priority of the message for Drupal.announce().\n     *\n     * @return {string}\n     *   ID of message.\n     */\n    add(message, options = {}) {\n      if (!options.hasOwnProperty('type')) {\n        options.type = 'status';\n      }\n\n      if (typeof message !== 'string') {\n        throw new Error('Message must be a string.');\n      }\n\n      // Send message to screen reader.\n      Drupal.message.announce(message, options);\n      // Use the provided index for the message or generate a unique key to\n      // allow message deletion.\n      options.id = options.id ?\n        String(options.id) :\n        `${options.type}-${Math.random().toFixed(15).replace('0.', '')}`;\n      this.messageWrapper.appendChild(Drupal.theme('message', { text: message }, options));\n\n      return options.id;\n    }\n\n    /**\n     * Select a set of messages based on index.\n     *\n     * @name Drupal.message~messageDefinition.select\n     *\n     * @param {string|Array.<string>} index\n     *   The message index to delete from the area.\n     *\n     * @return {NodeList|Array}\n     *   Elements found.\n     */\n    select(index) {\n      // When there are nothing to select, return an empty list.\n      if (!index || (Array.isArray(index) && index.length === 0)) {\n        return [];\n      }\n\n      // Constuct an array of selectors based on the available message index(s).\n      const selectors = (Array.isArray(index) ? index : [index])\n        .map(currentIndex => `[data-drupal-message-id^=\"${currentIndex}\"]`);\n\n      return this.messageWrapper.querySelectorAll(selectors.join(','));\n    }\n\n    /**\n     * Helper to remove elements.\n     *\n     * @param {NodeList|Array.<HTMLElement>} elements\n     *   DOM Nodes to be removed.\n     *\n     * @return {number}\n     *  Number of removed nodes.\n     */\n    removeElements(elements) {\n      if (!elements || !elements.length) {\n        return 0;\n      }\n\n      const length = elements.length;\n      for (let i = 0; i < length; i++) {\n        this.messageWrapper.removeChild(elements[i]);\n      }\n      return length;\n    }\n\n    /**\n     * Removes messages from the message area.\n     *\n     * @name Drupal.message~messageDefinition.remove\n     *\n     * @param {string|Array.<string>} ids\n     *   Index of the message to remove, as returned by\n     *   {@link Drupal.message~messageDefinition.add}, or an\n     *   array of indexes.\n     *\n     * @return {number}\n     *  Number of removed messages.\n     */\n    remove(ids) {\n      const messages = this.select(ids);\n      return this.removeElements(messages);\n    }\n\n    /**\n     * Removes all messages from the message area.\n     *\n     * @name Drupal.message~messageDefinition.clear\n     *\n     * @return {number}\n     *  Number of removed messages.\n     */\n    clear() {\n      const messages = this.messageWrapper.querySelectorAll('[data-drupal-message-id]');\n      return this.removeElements(messages);\n    }\n\n    /**\n     * Helper to call Drupal.announce() with the right parameters.\n     *\n     * @param {string} message\n     *   Displayed message.\n     * @param {object} options\n     *   Additional data.\n     * @param {string} [options.announce]\n     *   Screen-reader version of the message if necessary. To prevent a message\n     *   being sent to Drupal.announce() this should be `''`.\n     * @param {string} [options.priority]\n     *   Priority of the message for Drupal.announce().\n     * @param {string} [options.type]\n     *   Message type, can be either 'status', 'error' or 'warning'.\n     */\n    static announce(message, options) {\n      if (!options.priority && (options.type === 'warning' || options.type === 'error')) {\n        options.priority = 'assertive';\n      }\n      // If screen reader message is not disabled announce screen reader specific\n      // text or fallback to the displayed message.\n      if (options.announce !== '') {\n        Drupal.announce(options.announce || message, options.priority);\n      }\n    }\n  };\n\n  /**\n   * Theme function for a message.\n   *\n   * @param {object} message\n   *   The message object.\n   * @param {string} message.text\n   *   The message text.\n   * @param {object} options\n   *   The message context.\n   * @param {string} options.type\n   *   The message type.\n   * @param {string} options.id\n   *   ID of the message, for reference.\n   *\n   * @return {HTMLElement}\n   *   A DOM Node.\n   */\n  Drupal.theme.message = ({ text }, options) => {\n    const messagesTypes = Drupal.message.getMessageTypes();\n    const messageWraper = document.createElement('div');\n    // let messageText = message.text;\n    const messageText = document.createElement('h2');\n    messageText.setAttribute('class', 'visually-hidden');\n\n    messageWraper.setAttribute('class', `messages messages--${options.type}`);\n    messageWraper.setAttribute('role', 'contentinfo');\n    messageWraper.setAttribute('data-drupal-message-id', options.id);\n    messageWraper.setAttribute('data-drupal-message-type', options.type);\n    if (options.type in messagesTypes) {\n      messageWraper.setAttribute('aria-label', messagesTypes[options.type]);\n      messageText.innerHTML = messagesTypes[options.type];\n    }\n\n    // Alerts have a different HTML structure.\n    if (options.type === 'error') {\n      messageText.setAttribute('role', 'alert');\n    }\n    messageWraper.innerHTML = ` ${text}`;\n    messageWraper.insertAdjacentElement('afterbegin', messageText);\n\n    return messageWraper;\n  };\n})(Drupal);\n"]}
\ No newline at end of file