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diff --git a/inc/smarty/plugins/modifier.count_sentences.php b/inc/smarty/plugins/modifier.count_sentences.php
new file mode 100644
index 0000000..0c210f0
--- /dev/null
+++ b/inc/smarty/plugins/modifier.count_sentences.php
@@ -0,0 +1,28 @@
+<?php
+/**
+ * Smarty plugin
+ * @package Smarty
+ * @subpackage plugins
+ */
+
+
+/**
+ * Smarty count_sentences modifier plugin
+ *
+ * Type:     modifier<br>
+ * Name:     count_sentences
+ * Purpose:  count the number of sentences in a text
+ * @link http://smarty.php.net/manual/en/language.modifier.count.paragraphs.php
+ *          count_sentences (Smarty online manual)
+ * @param string
+ * @return integer
+ */
+function smarty_modifier_count_sentences($string)
+{
+    // find periods with a word before but not after.
+    return preg_match_all('/[^\s]\.(?!\w)/', $string, $match);
+}
+
+/* vim: set expandtab: */
+
+?>