Jakarta-ORO正则表达式库，它是最全面的正则表达式API之一，而且它与Perl 5正则表达式完全兼容。另外，它也是优化得最好的API之一。 -Jakarta-ORO regular expression library, which is the most comprehensive one of the regular expression API, and it is with Perl 5 compatible regular expressions. In addition

Cavaness - Programming Jakarta Struts 2e (O Reilly, 2004)-Cavaness - Programming Jakarta Struts 2e (O Reilly, 2004)