How to validate mobile number in Dynamic CRM

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Below is a JavaScript code to validate mobile number in Dynamic CRM

vjCity.ValidateMobileNumber = function (mobileNumber, fieldname)

{

 var re = /^[\+]?[(]?[0-9]{3}[)]?[-\s\.]?[0-9]{3}[-\s\.]?[0-9]{4,12}$/im;

 if (!re.test(mobileNumber))

 {

    if (Xrm.Page.context.getUserLcid() == 1025)

        vjCity.showFieldNotificiation(fieldname, "تعريف الرقم خطأ");

    else

        vjCity.showFieldNotificiation(fieldname, "Invalid number format");

 }

 else

 {

    vjCity.clearFieldNotification(fieldname);

 }

}

vjCity.showFieldNotificiation = function (fieldname, message) 

{

    Xrm.Page.getControl(fieldname).setNotification(message);

};

vjCity.clearFieldNotification = function (fieldname) 

{

    Xrm.Page.getControl(fieldname).clearNotification();

};

vjCity.showFormNotification = function (message, type, number) 

{

    Xrm.Page.ui.setFormNotification(message, type, number);

};

vjCity.clearFormNotification = function (number) 

{

    Xrm.Page.ui.clearFormNotification(number);

};