improve wildcard to support regular expressions
-----------------------------------------------

                 Key: WW-3262
                 URL: https://issues.apache.org/struts/browse/WW-3262
             Project: Struts 2
          Issue Type: Improvement
    Affects Versions: 2.1.8
            Reporter: Musachy Barroso
             Fix For: 2.1.9


The regular expressions will follow the syntax of JAX-RS. They can be like 
{PARAM_NAME} or {PARAM_NAME:REGEX}. For example:

       <package name="regex" extends="struts-default" namespace="/">
                <action name="/{bio:.+}/test/{name}" 
class="org.apache.struts2.showcase.UITagExample">
                        <result>/tags/ui/example.jsp</result>
                </action>
        </package>
        
        <package name="regex2" extends="struts-default" namespace="/superurl">
                <action name="/{bio:.+}/test/{name}" 
class="org.apache.struts2.showcase.UITagExample">
                        <result>/tags/ui/example.jsp</result>
                </action>
                <action name="/{bio:.+}/test2/{name}" 
class="org.apache.struts2.showcase.UITagExample">
                        <result>/tags/ui/{1}.jsp</result>
                </action>
        </package>

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