diff --git a/library/smarty/libs/plugins/modifiercompiler.count_sentences.php b/library/smarty/libs/plugins/modifiercompiler.count_sentences.php
new file mode 100644
--- /dev/null
+++ b/library/smarty/libs/plugins/modifiercompiler.count_sentences.php
@@ -0,0 +1,26 @@
+<?php
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifierCompiler
+ */
+
+/**
+ * Smarty count_sentences modifier plugin
+ * Type:     modifier<br>
+ * Name:     count_sentences
+ * Purpose:  count the number of sentences in a text
+ *
+ * @link    http://www.smarty.net/manual/en/language.modifier.count.paragraphs.php
+ *          count_sentences (Smarty online manual)
+ * @author  Uwe Tews
+ *
+ * @param array $params parameters
+ *
+ * @return string with compiled code
+ */
+function smarty_modifiercompiler_count_sentences($params) {
+    // find periods, question marks, exclamation marks with a word before but not after.
+    return 'preg_match_all("#\w[\.\?\!](\W|$)#S' . Smarty::$_UTF8_MODIFIER . '", ' . $params[0] . ', $tmp)';
+}