With the introduction of locales to support internationalization, regular expression patterns that worked for years stopped working on some systems. In particular, regular expressions that depended on...

With the introduction of locales to support internationalization, regular expression patterns that worked for years stopped working on some systems. In particular, regular expressions that depended on the traditional C collating sequence, do not always work with the dictionary collating sequence. In most cases, the solution is to use predefi ned character classes instead of ranges. For example, you should use [:lower:] instead of a-z. (See Figure 20-3 for the full set.) What do you think of this arrangement? Give three reasons why the old system was better. Give three reasons why the new system is better.