diff --git a/core/lib/Drupal/Component/Transliteration/PhpTransliteration.php b/core/lib/Drupal/Component/Transliteration/PhpTransliteration.php
index 53cf036..8e85eb3 100644
--- a/core/lib/Drupal/Component/Transliteration/PhpTransliteration.php
+++ b/core/lib/Drupal/Component/Transliteration/PhpTransliteration.php
@@ -78,6 +78,37 @@ public function __construct($data_directory = NULL) {
   /**
    * {@inheritdoc}
    */
+  public function removeDiacritics($string) {
+    $result = '';
+
+    foreach (preg_split('//u', $string, 0, PREG_SPLIT_NO_EMPTY) as $character) {
+      $code = self::ordUTF8($character);
+
+      // These two Unicode ranges include the accented US-ASCII letters, with a
+      // few characters that aren't accented letters mixed in. So define the
+      // ranges and the excluded characters.
+      $range1 = $code > 0x00bf && $code < 0x017f;
+      $exclusions_range1 = array(0x00d0, 0x00d7, 0x00f0, 0x00f7, 0x0138, 0x014a, 0x014b);
+      $range2 = $code > 0x01cc && $code < 0x0250;
+      $exclusions_range2 = array(0x01DD, 0x01f7, 0x021c, 0x021d, 0x0220, 0x0221, 0x0241, 0x0242, 0x0245);
+
+      $replacement = $character;
+      if (($range1 && !in_array($code, $exclusions_range1)) || ($range2 && !in_array($code, $exclusions_range2))) {
+        $to_add = $this->lookupReplacement($code, 'xyz');
+        if(strlen($to_add) === 1) {
+          $replacement = $to_add;
+        }
+      }
+
+      $result .= $replacement;
+    }
+
+    return $result;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function transliterate($string, $langcode = 'en', $unknown_character = '?', $max_length = NULL) {
     $result = '';
     $length = 0;
@@ -152,7 +183,8 @@ protected static function ordUTF8($character) {
    *
    * @return string
    *   US-ASCII replacement character. If it has a mapping, it is returned;
-   *   otherwise, $unknown_character is returned.
+   *   otherwise, $unknown_character is returned. The replacement can contain
+   *   multiple characters.
    */
   protected function replace($code, $langcode, $unknown_character) {
     if ($code < 0x80) {
@@ -168,6 +200,24 @@ protected function replace($code, $langcode, $unknown_character) {
       return $this->languageOverrides[$langcode][$code];
     }
 
+    return $this->lookupReplacement($code, $unknown_character);
+  }
+
+  /**
+   * Look up the generic replacement for a UTF-8 character code.
+   *
+   * @param $code
+   *   The UTF-8 character code.
+   * @param string $unknown_character
+   *   (optional) The character to substitute for characters without entries in
+   *   the replacement tables.
+   *
+   * @return string
+   *   US-ASCII replacement characters. If it has a mapping, it is returned;
+   *   otherwise, $unknown_character is returned. The replacement can contain
+   *   multiple characters.
+   */
+  protected function lookupReplacement($code, $unknown_character = '?') {
     // See if there is a generic mapping for this character.
     $bank = $code >> 8;
     if (!isset($this->genericMap[$bank])) {
diff --git a/core/lib/Drupal/Component/Transliteration/TransliterationInterface.php b/core/lib/Drupal/Component/Transliteration/TransliterationInterface.php
index 8eda816..4d088ef 100644
--- a/core/lib/Drupal/Component/Transliteration/TransliterationInterface.php
+++ b/core/lib/Drupal/Component/Transliteration/TransliterationInterface.php
@@ -15,6 +15,22 @@
 interface TransliterationInterface {
 
   /**
+   * Removes diacritics (accents) from certain letters.
+   *
+   * This only applies to certain letters: Accented Latin characters like
+   * a-with-acute-accent, in the UTF-8 character range of 0xE0 to 0xE6 and
+   * 01CD to 024F. Replacements that would result in the string changing length
+   * are excluded, as well as characters that are not accented US-ASCII letters.
+   *
+   * @param string $string
+   *   The string holding diacritics.
+   *
+   * @return string
+   *   $string with accented letters replaced by their unaccented equivalents.
+   */
+  public function removeDiacritics($string);
+
+  /**
    * Transliterates text from Unicode to US-ASCII.
    *
    * @param string $string
diff --git a/core/modules/search/search.module b/core/modules/search/search.module
index e05576d..e5a5199 100644
--- a/core/modules/search/search.module
+++ b/core/modules/search/search.module
@@ -241,6 +241,9 @@ function search_simplify($text, $langcode = NULL) {
   // Lowercase
   $text = Unicode::strtolower($text);
 
+  // Remove diacitics.
+  $text = \Drupal::service('transliteration')->removeDiacritics($text);
+
   // Call an external processor for word handling.
   search_invoke_preprocess($text, $langcode);
 
diff --git a/core/modules/search/src/Tests/SearchNodeDiacriticsTest.php b/core/modules/search/src/Tests/SearchNodeDiacriticsTest.php
new file mode 100644
index 0000000..9b12944
--- /dev/null
+++ b/core/modules/search/src/Tests/SearchNodeDiacriticsTest.php
@@ -0,0 +1,84 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\search\Tests\SearchNodeDiacriticsTest.
+ */
+
+namespace Drupal\search\Tests;
+
+/**
+ * Tests search functionality with diacritics.
+ *
+ * @group search
+ */
+class SearchNodeDiacriticsTest extends SearchTestBase {
+
+  /**
+   * A user with permission to use advanced search.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  public $testUser;
+
+  protected function setUp() {
+    parent::setUp();
+    node_access_rebuild();
+
+    // Create a test user and log in.
+    $this->testUser = $this->drupalCreateUser(array('access content', 'search content', 'use advanced search', 'access user profiles'));
+    $this->drupalLogin($this->testUser);
+  }
+
+  /**
+   * Tests that search returns results with diacritics in the search phrase.
+   */
+  function testPhraseSearchPunctuation() {
+    $body_text = 'The Enricþment Center is cómmīŦŧęđ to the well BɆĬŇĜ of æll påŔťıçȉpǎǹţș. ';
+    $body_text .= 'Also meklēt (see #731298)';
+    $this->drupalCreateNode(array('body' => array(array('value' => $body_text))));
+
+    // Update the search index.
+    $this->container->get('plugin.manager.search')->createInstance('node_search')->updateIndex();
+    search_update_totals();
+
+    // Refresh variables after the treatment.
+    $this->refreshVariables();
+
+    $edit = array('keys' => 'meklet');
+    $this->drupalPostForm('search/node', $edit, t('Search'));
+    $this->assertRaw('<strong>meklēt</strong>');
+
+    $edit = array('keys' => 'meklēt');
+    $this->drupalPostForm('search/node', $edit, t('Search'));
+    $this->assertRaw('<strong>meklēt</strong>');
+
+    $edit = array('keys' => 'cómmīŦŧęđ BɆĬŇĜ påŔťıçȉpǎǹţș');
+    $this->drupalPostForm('search/node', $edit, t('Search'));
+    $this->assertRaw('<strong>cómmīŦŧęđ</strong>');
+    $this->assertRaw('<strong>BɆĬŇĜ</strong>');
+    $this->assertRaw('<strong>påŔťıçȉpǎǹţș</strong>');
+
+    $edit = array('keys' => 'committed being participants');
+    $this->drupalPostForm('search/node', $edit, t('Search'));
+    $this->assertRaw('<strong>cómmīŦŧęđ</strong>');
+    $this->assertRaw('<strong>BɆĬŇĜ</strong>');
+    $this->assertRaw('<strong>påŔťıçȉpǎǹţș</strong>');
+
+    $edit = array('keys' => 'Enricþment');
+    $this->drupalPostForm('search/node', $edit, t('Search'));
+    $this->assertRaw('<strong>Enricþment</strong>');
+
+    $edit = array('keys' => 'Enritchment');
+    $this->drupalPostForm('search/node', $edit, t('Search'));
+    $this->assertNoRaw('<strong>Enricþment</strong>');
+
+    $edit = array('keys' => 'æll');
+    $this->drupalPostForm('search/node', $edit, t('Search'));
+    $this->assertRaw('<strong>æll</strong>');
+
+    $edit = array('keys' => 'all');
+    $this->drupalPostForm('search/node', $edit, t('Search'));
+    $this->assertNoRaw('<strong>æll</strong>');
+  }
+}
diff --git a/core/tests/Drupal/Tests/Component/Transliteration/PhpTransliterationTest.php b/core/tests/Drupal/Tests/Component/Transliteration/PhpTransliterationTest.php
index f1b3705..f01ee05 100644
--- a/core/tests/Drupal/Tests/Component/Transliteration/PhpTransliterationTest.php
+++ b/core/tests/Drupal/Tests/Component/Transliteration/PhpTransliterationTest.php
@@ -21,6 +21,58 @@
 class PhpTransliterationTest extends UnitTestCase {
 
   /**
+   * Tests the PhpTransliteration::removeDiacritics() function.
+   *
+   * @param string $original
+   *   The language code to test.
+   * @param string $expected
+   *   The expected return from PhpTransliteration::removeDiacritics().
+   *
+   * @dataProvider providerTestPhpTransliterationRemoveDiacritics
+   */
+  public function testRemoveDiacritics($original, $expected) {
+    $transliterator_class = new PhpTransliteration();
+    $result = $transliterator_class->removeDiacritics($original);
+    $this->assertEquals($expected, $result);
+  }
+
+  /**
+   * Provides data for self::testRemoveDiacritics().
+   *
+   * @return array
+   *   An array of arrays, each containing the parameters for
+   *   self::testRemoveDiacritics().
+   */
+  public function providerTestPhpTransliterationRemoveDiacritics() {
+    return array(
+      // Test all characters in the Unicode range 0x00bf to 0x017f.
+      array('ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏ', 'AAAAAAÆCEEEEIIII'),
+      array('ÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞß', 'ÐNOOOOO×OUUUUYÞß'),
+      array('àáâãäåæçèéêëìíîï', 'aaaaaaæceeeeiiii'),
+      array('ðñòóôõö÷øùúûüýþÿ', 'ðnooooo÷ouuuuyþy'),
+      array('ĀāĂ㥹ĆćĈĉĊċČčĎď', 'AaAaAaCcCcCcCcDd'),
+      array('ĐđĒēĔĕĖėĘęĚěĜĝĞğ', 'DdEeEeEeEeEeGgGg'),
+      array('ĠġĢģĤĥĦħĨĩĪīĬĭĮį', 'GgGgHhHhIiIiIiIi'),
+      array('İıIJijĴĵĶķĸĹĺĻļĽľĿ', 'IiIJijJjKkĸLlLlLlL'),
+      array('ŀŁłŃńŅņŇňʼnŊŋŌōŎŏ', 'lLlNnNnNnʼnŊŋOoOo'),
+      array('ŐőŒœŔŕŖŗŘřŚśŜŝŞş', 'OoŒœRrRrRrSsSsSs'),
+      array('ŠšŢţŤťŦŧŨũŪūŬŭŮů', 'SsTtTtTtUuUuUuUu'),
+      array('ŰűŲųŴŵŶŷŸŹźŻżŽž', 'UuUuWwYyYZzZzZz'),
+
+      // Test all characters in the Unicode range 0x01CD to 0x024F.
+      array('ǍǎǏ', 'AaI'),
+      array('ǐǑǒǓǔǕǖǗǘǙǚǛǜǝǞǟ', 'iOoUuUuUuUuUuǝAa'),
+      array('ǠǡǢǣǤǥǦǧǨǩǪǫǬǭǮǯ', 'AaǢǣGgGgKkOoOoǮǯ'),
+      array('ǰDZDzdzǴǵǶǷǸǹǺǻǼǽǾǿ', 'jDZDzdzGgǶǷNnAaǼǽOo'),
+      array('ȀȁȂȃȄȅȆȇȈȉȊȋȌȍȎȏ', 'AaAaEeEeIiIiOoOo'),
+      array('ȐȑȒȓȔȕȖȗȘșȚțȜȝȞȟ', 'RrRrUuUuSsTtȜȝHh'),
+      array('ȠȡȢȣȤȥȦȧȨȩȪȫȬȭȮȯ', 'ȠȡȢȣZzAaEeOoOoOo'),
+      array('ȰȱȲȳȴȵȶȷȸȹȺȻȼȽȾȿ', 'OoYylntjȸȹACcLTs'),
+      array('ɀɁɂɃɄɅɆɇɈɉɊɋɌɍɎɏ', 'zɁɂBUɅEeJjQqRrYy'),
+    );
+  }
+
+  /**
    * Tests the PhpTransliteration class.
    *
    * @param string $langcode