diff -r cffa2777d917 -r 8d0d1b368de0 sources/mystring.cpp
--- a/sources/mystring.cpp	Fri Dec 12 01:37:04 2014 +0200
+++ b/sources/mystring.cpp	Sat Dec 13 04:32:15 2014 +0200
@@ -489,3 +489,23 @@
 	checksum[sizeof checksum - 1] = '\0';
 	return String (checksum);
 }
+
+// -------------------------------------------------------------------------------------------------
+//
+METHOD
+String::normalize (int (*filter)(int)) -> void
+{
+	int a = 0;
+	int b = length() - 1;
+
+	while ((*filter) (m_string[a]) and a != b)
+		++a;
+
+	while ((*filter) (m_string[b]) and a != b)
+		--b;
+
+	if (a == b)
+		m_string = "";
+	else if (a != 0 or b != length() - 1)
+		m_string = m_string.substr (a, b - a + 1);
+}