What is a formal representation, which is for the file, string, through a very special representation, Search and Replace, because there are many system settings on UNIX, are stored in text files, so network management or program design It is often necessary to search and replace, so developing a special command called a formal representation we can simply use the "S / LT; / G" regularly convert all the "<" of the "<" in the string into the strings. "LT;" Therefore, JDK1.4 provides a set of formal representative packages for your use of JDK1.4 or less than Http://jakarta.apache.org/oro gets a string of Package. The symbol "S /
