diff --git a/src/kits/support/String.cpp b/src/kits/support/String.cpp
index 982a0db010..b3fdc7de30 100644
--- a/src/kits/support/String.cpp
+++ b/src/kits/support/String.cpp
@@ -36,6 +36,8 @@
 // System Includes -------------------------------------------------------------
 #include <String.h>
 
+// Temporary Includes
+#include "string_helper.h"
 
 /*---- Construction --------------------------------------------------------*/
 BString::BString()
@@ -628,6 +630,36 @@ BString::FindFirst(char c, int32 fromOffset) const
 }
 
 
+int32
+BString::FindLast(const BString &string) const
+{
+	return _FindBefore(string.String(), Length(), -1);
+}
+
+
+int32
+BString::FindLast(const char *str) const
+{
+	return _FindBefore(str, Length(), -1);
+}
+
+
+int32
+BString::FindLast(const BString &string, int32 beforeOffset) const
+{
+	return _FindBefore(string.String(), beforeOffset, -1); 
+}
+
+
+int32
+BString::FindLast(char c) const
+{
+	char tmp[2] = { c, '\0' };
+	
+	return _FindBefore(tmp, Length(), -1);
+}
+
+
 int32
 BString::IFindFirst(const BString &string) const
 {
@@ -656,6 +688,34 @@ BString::IFindFirst(const char *string, int32 fromOffset) const
 }
 
 
+int32
+BString::IFindLast(const BString &string) const
+{
+	return _IFindBefore(string.String(), Length(), -1);
+}
+
+
+int32
+BString::IFindLast(const char *string) const
+{
+	return _IFindBefore(string, Length(), -1);
+}
+
+
+int32
+BString::IFindLast(const BString &string, int32 beforeOffset) const
+{
+	return _IFindBefore(string.String(), beforeOffset, -1);
+}
+
+
+int32
+BString::IFindLast(const char *string, int32 beforeOffset) const
+{
+	return _IFindBefore(string, beforeOffset, -1);
+}
+
+
 /*---- Replacing -----------------------------------------------------------*/
 BString&
 BString::ReplaceFirst(char replaceThis, char withThis)
@@ -1163,23 +1223,53 @@ BString::_ShortFindAfter(const char *str, int32 ) const
 
 
 int32
-BString::_FindBefore(const char *str, int32 offset, int32 ) const
+BString::_FindBefore(const char *str, int32 offset, int32) const
 {
-	assert(str != NULL);
+	if (!str)
+		return 0;
+	
 	if (offset <= 0)
 		return B_ERROR;
 	
-	//TODO: Implement
+	int len2 = strlen(str);
+
+	if (len2 == 0)
+		return 0;
+		
+	char *ptr1 = _privateData + offset - len2;
 	
-	return B_ERROR;	
+	while (ptr1 >= _privateData) {
+		if (!memcmp(ptr1, str, len2))
+			return ptr1 - _privateData; 
+		ptr1--;
+	}
+	
+	return B_ERROR;
 }
 
 
 int32
-BString::_IFindBefore(const char *str, int32 , int32 ) const
+BString::_IFindBefore(const char *str, int32 offset, int32) const
 {
-	assert(str != NULL);
-	//TODO: Implement
+	if (!str)
+		return 0;
+	
+	if (offset <= 0)
+		return B_ERROR;
+	
+	int len2 = strlen(str);
+
+	if (len2 == 0)
+		return 0;
+		
+	char *ptr1 = _privateData + offset - len2;
+	
+	while (ptr1 >= _privateData) {
+		if (!strncasecmp(ptr1, str, len2))
+			return ptr1 - _privateData; 
+		ptr1--;
+	}
+	
 	return B_ERROR;
 }
 
@@ -1193,6 +1283,7 @@ BString::_SetLength(int32 length)
 
 #if DEBUG
 // TODO: Implement?
+// AFAIK, these are not implemented in BeOS R5
 BString::_SetUsingAsCString(bool) {}
 BString::_AssertNotUsingAsCString() {}
 #endif
diff --git a/src/kits/support/string_helper.cpp b/src/kits/support/string_helper.cpp
new file mode 100644
index 0000000000..c94b58e5bb
--- /dev/null
+++ b/src/kits/support/string_helper.cpp
@@ -0,0 +1,26 @@
+//Those functions are here just to compile BString.
+//They will be removed as soon as our libc compiles.
+
+#include <ctype.h>
+#include <string.h>
+
+char *
+strcasestr(const char *s, const char *find)
+{
+	char c, sc;
+	size_t len;
+
+	if ((c = *find++) != 0) {
+		c = tolower((unsigned char)c);
+		len = strlen(find);
+		do {
+			do {
+				if ((sc = *s++) == 0)
+					return NULL;
+			} while ((char)tolower((unsigned char)sc) != c);
+		} while (strncasecmp(s, find, len) != 0);
+		s--;
+	}
+	return (char *)s;
+}
+
diff --git a/src/kits/support/string_helper.h b/src/kits/support/string_helper.h
new file mode 100644
index 0000000000..252ad95521
--- /dev/null
+++ b/src/kits/support/string_helper.h
@@ -0,0 +1,9 @@
+//Those functions are here just to compile BString.
+//They will be removed as soon as our libc compiles.
+
+#ifndef __stringhelper_h
+#define __stringhelper_h
+
+extern char *strcasestr(const char *s, const char *find);
+
+#endif //__stringhelper_h
\ No newline at end of file
diff --git a/src/kits/support/support.src b/src/kits/support/support.src
index cfe9cfe911..23dd01e671 100644
--- a/src/kits/support/support.src
+++ b/src/kits/support/support.src
@@ -7,4 +7,5 @@ SUPPORT_KIT_SOURCE =
 	Locker.cpp
 	StopWatch.cpp
 	#String.cpp
+	#string_helper.cpp
 ;