diff --git a/build_linux64/libamsstring4.linux64.a b/build_linux64/libamsstring4.linux64.a
index afea311..819532a 100644
Binary files a/build_linux64/libamsstring4.linux64.a and b/build_linux64/libamsstring4.linux64.a differ
diff --git a/build_linux64/objstore/amsstring4_class.o b/build_linux64/objstore/amsstring4_class.o
index f8c3ab4..97cbf55 100644
Binary files a/build_linux64/objstore/amsstring4_class.o and b/build_linux64/objstore/amsstring4_class.o differ
diff --git a/build_linux64/objstore/amsstring4_convenience1.o b/build_linux64/objstore/amsstring4_convenience1.o
index cc885bb..9d9b8e3 100644
Binary files a/build_linux64/objstore/amsstring4_convenience1.o and b/build_linux64/objstore/amsstring4_convenience1.o differ
diff --git a/src/amsstring4/amsstring4_class.cpp b/src/amsstring4/amsstring4_class.cpp
index f8fa68a..4a6c68f 100644
--- a/src/amsstring4/amsstring4_class.cpp
+++ b/src/amsstring4/amsstring4_class.cpp
@@ -782,6 +782,47 @@ namespace ams
       int ret = -1;
       //todo
 
+      bool b1,b2,beq;
+      int mode;
+      int findstrlen = amsstring_strlen(findstr);
+      int I,J;
+      ams_chartype c1,c2,cc;
+
+      J = findstrlen-1;
+      mode = 0;
+      cc = 0;
+      for(I=length-indstart-1;I>=0;I--)
+      {
+        c1 = cstring[I];
+        c2 = findstr[J];
+        b1 = casesens&&(c1==c2);
+        b2 = (!casesens)&&(ams::tolower(c1)==ams::tolower(c2));
+        beq = b1 || b2;
+        
+        if(beq && mode==0)
+        {
+          mode = 1;
+        }
+
+        if(beq && mode==1)
+        {
+          cc+=1;
+          J--;
+          if(cc==findstrlen || J<0)
+          {
+            ret = I;
+            break;
+          }
+        }
+
+        if(!beq && mode==1)
+        {
+          mode = 0;
+          cc = 0;
+          J = findstrlen-1;
+        }
+      }
+
       return ret;
     }
 
diff --git a/src/amsstring4/amsstring4_convenience1.cpp b/src/amsstring4/amsstring4_convenience1.cpp
index e33d584..39a4af7 100644
--- a/src/amsstring4/amsstring4_convenience1.cpp
+++ b/src/amsstring4/amsstring4_convenience1.cpp
@@ -352,8 +352,21 @@ amsstring stripallwhitespace(const amsstring &s)
 amsarray<amsstring> splitext(const amsstring &s)
 {
     amsarray<amsstring> ret;
+    ret.resize(2);
 
-    //todo
+    int ind;
+    
+    ind = s.findright('.');
+    if(ind<0)
+    {
+        ret[0] = s;
+        ret[1] = "";
+    }
+    else
+    {
+        ret[0] = s.substring(0,ind);
+        ret[1] = s.substring(ind,s.length);
+    }
     
     return ret;
 }
@@ -363,8 +376,34 @@ amsarray<amsstring> splitext(const amsstring &s)
 amsarray<amsstring> splitpath(const amsstring &s)
 {
     amsarray<amsstring> ret;
+    ret.resize(2);
+    int ind1,ind2;
 
-    //todo
+    ind1 = s.find('/');
+    ind2 = s.find('\\');
+    if(ind1>=0)
+    {
+        if(ind1==0)
+        {
+            ret[0] = "/";
+        }
+        else
+        {
+            ret[0] = s.substring(0,ind1);
+        }
+        ret[1] = s.substring(ind1+1,s.length);
+    }
+    else if(ind2>=0)
+    {
+        ret[0] = s.substring(0,ind2);
+        ret[1] = s.substring(ind2+1,s.length);
+    }
+    else
+    {
+        ret[0] = "";
+        ret[1] = s;
+    }
+    
 
     return ret;
 }
@@ -374,7 +413,15 @@ amsstring select_between(const amsstring &s, const ams_chartype delimitleft, con
 {
     amsstring ret;
 
-    //todo
+    int ind1,ind2;
+
+    ind1 = s.find(delimitleft);
+    ind2 = s.find(delimitright);
+
+    if(ind1<0) ind1=0;
+    if(ind2<0) ind2=s.length;
+
+    ret = s.substring(ind1,ind2);
 
     return ret;
 }