diff --git a/ZString.cpp b/ZString.cpp
index dc21d06..81c5c9f 100644
--- a/ZString.cpp
+++ b/ZString.cpp
@@ -68,6 +68,10 @@ namespace coreutils {
       return (strncmp(data, valuex.data, valuex.length <= length ? valuex.length : length) == 0);
    }
 
+   bool ZString::operator==(const char *valuex) const {
+      return (strncmp(data, valuex, length) == 0);
+   }
+
    bool ZString::operator!=(const ZString &valuex) const {
 //      if(length != valuex.getLength())
 //	return false;
@@ -75,9 +79,8 @@ namespace coreutils {
    }
 
    bool ZString::operator!=(const char *valuex) const {
-      size_t len = strlen(valuex);
-      if(length != len)
-	return true;
+      if(strlen(valuex) != length)
+        return true;
       return (strncmp(data, valuex, length) != 0);
    }
 
@@ -124,6 +127,19 @@ namespace coreutils {
       cdata[length] = '\0';
       return cdata;
    }   
+
+   ZString ZString::substring(int start) {
+      char *end = data + length;
+      char *startChar = data + start;
+      if(startChar < end) {
+	 return ZString(startChar, end - startChar);
+      }
+      return ZString();
+   }
+   
+   ZString ZString::substring(int start, int len) {
+      return ZString();
+   }   
    
    std::vector<ZString> &ZString::split(std::string delimiter, size_t maxSize) {
       coreutils::ZString zDelimiter((char *)delimiter.c_str(), delimiter.size());
diff --git a/ZString.h b/ZString.h
index 3987b4c..b7790e7 100644
--- a/ZString.h
+++ b/ZString.h
@@ -42,7 +42,7 @@ namespace coreutils {
       ZString();
 
       ///
-      ///
+      /// Constructor wrapping a null terminated buffer to a ZString.
       ///
 
       ZString(const char *data);
@@ -53,6 +53,10 @@ namespace coreutils {
 
       ZString(char *data, size_t length);
 
+      ///
+      ///
+      ///
+      
       ZString(const char *data, size_t length);
 
       ///
@@ -74,8 +78,8 @@ namespace coreutils {
       ~ZString();
 
       ///
-      /// A friend method used to write the value of the ZString from the cursor
-      /// point to an ostream using the << syntax.
+      /// A friend method used to write the value of the ZString 
+      /// to an ostream using the << syntax.
       ///
 
       friend std::ostream& operator<<(std::ostream& os, const ZString& zstring);
@@ -83,9 +87,19 @@ namespace coreutils {
       friend std::ostream& operator+(std::ostream& os, const ZString& zstring);
       friend std::ostream& operator+(std::ostream& os, const char *value);
 
+      ///
+      ///
+      ///
+      
       bool operator<(const ZString &valuex) const;
+
+      ///
+      ///
+      ///
+      
       bool operator>(const ZString &valuex) const;
       bool operator==(const ZString &valuex) const;
+      bool operator==(const char *valuex) const;
       bool operator!=(const ZString &valuex) const;
       bool operator!=(const char *valuex) const;
 
@@ -146,6 +160,18 @@ namespace coreutils {
       ///
       ///
 
+      ZString substring(int start);
+
+      ///
+      ///
+      ///
+      
+      ZString substring(int start, int len);
+      
+      ///
+      ///
+      ///
+
       std::vector<ZString> &split(ZString &delimiter, size_t maxSize = 0);
 
       ///
@@ -168,6 +194,10 @@ namespace coreutils {
 
       ZString getTokenExclude(const char *exclude);
 
+      ///
+      ///
+      ///
+      
       ZString getTokenExclude(std::string exclude);
 
       ///
@@ -219,8 +249,16 @@ namespace coreutils {
 
       bool ifNext(const char *value);
 
+      ///
+      ///
+      ///
+      
       bool ifNext(ZString &value);
 
+      ///
+      ///
+      ///
+      
       int ifEqualsCount(ZString &comparator);
 
       ///
@@ -255,6 +293,10 @@ namespace coreutils {
 
       char* getCursor();
 
+      ///
+      ///
+      ///
+      
       void setCursor(char *cursor);
 
       ///
diff --git a/testing/mstring_test b/testing/mstring_test
index c42765e..01f0d21 100755
Binary files a/testing/mstring_test and b/testing/mstring_test differ
diff --git a/testing/zstring_test b/testing/zstring_test
index d84faa0..5d13824 100755
Binary files a/testing/zstring_test and b/testing/zstring_test differ
diff --git a/testing/zstring_test.cpp b/testing/zstring_test.cpp
index 5cacf58..e18dd76 100644
--- a/testing/zstring_test.cpp
+++ b/testing/zstring_test.cpp
@@ -22,4 +22,9 @@ int main(int argc, char **argv) {
    for(int ix = 0; ix < test.getList().size(); ++ix) 
      std::cout << ix << ":" << test[ix] << std::endl;
 
+   // Test substring operations.
+
+   coreutils::ZString test2("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ");
+   std::cout << "substring: [" << test2.substring(10) << "]" << std::endl;
+
 }