Java Development Tools

How to do regular expression validation for Phone Number for the below case

1) With Country Code

2) Applicable to all Countries

<af:inputText value="#{bindings.Mobile.inputValue}" autoSubmit="true"

                        label="#{bindings.Mobile.hints.label}"

                        required="#{bindings.Mobile.hints.mandatory}"

                        columns="#{bindings.Mobile.hints.displayWidth}"

                        maximumLength="#{bindings.Mobile.hints.precision}"

                        shortDesc="#{bindings.Mobile.hints.tooltip}"

                        id="itMobile" partialTriggers="t1xxx">

            <f:validator binding="#{bindings.Mobile.validator}"/>

          </af:inputText>