Enumerates the substrings of the specified type in the specified range of the string.
Original signature is '- (void)enumerateSubstringsInRange:(NSRange)range options:(NSStringEnumerationOptions)opts usingBlock:(void (^)(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop))block'
Available in Mac OS X v10.6 and later.

C# | Visual Basic | Visual C++ |
public virtual void EnumerateSubstringsInRangeOptionsUsingBlock( NSRange range, NSStringEnumerationOptions opts, Action<NSString, NSRange, NSRange, IntPtr> block )

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later)