diff --git a/func/string.php b/func/string.php
index c94f85a2..111c57eb 100644
--- a/func/string.php
+++ b/func/string.php
@@ -11,3 +11,33 @@ function myvesta_replace_in_file($find, $replace, $file) {
     $r=file_put_contents($file, $buf);
     return $r;
 }
+
+function myvesta_str_get_between (&$text, $left_substring, $right_substring, $start=0, $do_not_return_left_substring=1, $do_not_return_right_substring=1, $left_substring_necessary=1, $right_substring_necessary=1)
+{
+	$from_null=0;
+	$pos1=strpos($text, $left_substring, $start);
+	if ($pos1===FALSE)
+	{
+		if ($left_substring_necessary==1) return "";
+		$pos1=$start;
+		$from_null=1;
+	}
+
+	if ($do_not_return_left_substring==1)
+	{
+		if ($from_null==0) $pos1=$pos1+strlen($left_substring);
+	}
+	$pos2=strpos($text, $right_substring, $pos1+1);
+	if ($pos2===FALSE)
+	{
+		if ($right_substring_necessary==1) return "";
+		$pos2=strlen($text);
+	}
+	if ($do_not_return_right_substring==1) $len=$pos2-$pos1;
+	else $len=($pos2-$pos1)+strlen($right_substring);
+	
+	$slen=strlen($text);
+	if ($pos1+$len>$slen) $len=$slen-$pos1;
+	
+	return substr($text, $pos1, $len);
+}