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diff --git a/phpBB/phpbb/textformatter/s9e/utils.php b/phpBB/phpbb/textformatter/s9e/utils.php
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index 0000000000..a9a6d4b892
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+++ b/phpBB/phpbb/textformatter/s9e/utils.php
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+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\textformatter\s9e;
+
+/**
+* Text manipulation utilities
+*/
+class utils implements \phpbb\textformatter\utils_interface
+{
+	/**
+	* Replace BBCodes and other formatting elements with whitespace
+	*
+	* NOTE: preserves smilies as text
+	*
+	* @param  string $xml Parsed text
+	* @return string      Plain text
+	*/
+	public function clean_formatting($xml)
+	{
+		// Insert a space before <s> and <e> then remove formatting
+		$xml = preg_replace('#<[es]>#', ' $0', $xml);
+
+		return \s9e\TextFormatter\Utils::removeFormatting($xml);
+	}
+
+	/**
+	* Format given string to be used as an attribute value
+	*
+	* Will return the string as-is if it can be used in a BBCode without quotes. Otherwise,
+	* it will use either single- or double- quotes depending on whichever requires less escaping.
+	* Quotes and backslashes are escaped with backslashes where necessary
+	*
+	* @param  string $str Original string
+	* @return string      Same string if possible, escaped string within quotes otherwise
+	*/
+	protected function format_attribute_value($str)
+	{
+		if (!preg_match('/[ "\'\\\\\\]]/', $str))
+		{
+			// Return as-is if it contains none of: space, ' " \ or ]
+			return $str;
+		}
+		$singleQuoted = "'" . addcslashes($str, "\\'") . "'";
+		$doubleQuoted = '"' . addcslashes($str, '\\"') . '"';
+
+		return (strlen($singleQuoted) < strlen($doubleQuoted)) ? $singleQuoted : $doubleQuoted;
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function generate_quote($text, array $attributes = array())
+	{
+		$text = trim($text);
+		$quote = '[quote';
+		if (isset($attributes['author']))
+		{
+			// Add the author as the BBCode's default attribute
+			$quote .= '=' . $this->format_attribute_value($attributes['author']);
+			unset($attributes['author']);
+		}
+
+		if (isset($attributes['user_id']) && $attributes['user_id'] == ANONYMOUS)
+		{
+			unset($attributes['user_id']);
+		}
+
+		ksort($attributes);
+		foreach ($attributes as $name => $value)
+		{
+			$quote .= ' ' . $name . '=' . $this->format_attribute_value($value);
+		}
+		$quote .= ']';
+		$newline = (strlen($quote . $text . '[/quote]') > 80 || strpos($text, "\n") !== false) ? "\n" : '';
+		$quote .= $newline . $text . $newline . '[/quote]';
+
+		return $quote;
+	}
+
+	/**
+	* Get a list of quote authors, limited to the outermost quotes
+	*
+	* @param  string   $xml Parsed text
+	* @return string[]      List of authors
+	*/
+	public function get_outermost_quote_authors($xml)
+	{
+		$authors = array();
+		if (strpos($xml, '<QUOTE ') === false)
+		{
+			return $authors;
+		}
+
+		$dom = new \DOMDocument;
+		$dom->loadXML($xml);
+		$xpath = new \DOMXPath($dom);
+		foreach ($xpath->query('//QUOTE[not(ancestor::QUOTE)]/@author') as $author)
+		{
+			$authors[] = $author->textContent;
+		}
+
+		return $authors;
+	}
+
+	/**
+	* Remove given BBCode and its content, at given nesting depth
+	*
+	* @param  string  $xml         Parsed text
+	* @param  string  $bbcode_name BBCode's name
+	* @param  integer $depth       Minimum nesting depth (number of parents of the same name)
+	* @return string               Parsed text
+	*/
+	public function remove_bbcode($xml, $bbcode_name, $depth = 0)
+	{
+		return \s9e\TextFormatter\Utils::removeTag($xml, strtoupper($bbcode_name), $depth);
+	}
+
+	/**
+	* Return a parsed text to its original form
+	*
+	* @param  string $xml Parsed text
+	* @return string      Original plain text
+	*/
+	public function unparse($xml)
+	{
+		return \s9e\TextFormatter\Unparser::unparse($xml);
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function is_empty($text)
+	{
+		if ($text === null || $text === '')
+		{
+			return true;
+		}
+
+		return trim($this->unparse($text)) === '';
+	}
+}