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Motivation "Artificial Intelligence (AI) is considered a major innovation that could disrupt many things. Some people even compare it to the Internet. A large investor firm predicted that some AI startups could become the next Apple, Google or Amazon within five years"   - Prof. John Vu, Carnegie Mellon University. Using chatbots to support our daily tasks is super useful and interesting. In fact, "Jenkins CI, Jira Cloud, and Bitbucket" have been becoming must-have apps in Slack of my team these days. There are some existing approaches for chatbots including pattern matching, algorithms, and neutral networks. RiveScript is a scripting language using "pattern matching" as a simple and powerful approach for building up a Chabot. Architecture Actually, it was flexible to choose a programming language for the used Rivescript interpreter like Java, Go, Javascript, Python, and Perl. I went with Java. Used Technologies and Tools Oracle JDK 1.8

You can find the demonstrated code of this post on my Github repo here . The user story " As a banker, I want to enter a client's birthday like 01.01.80 or 01.01.1980, So that the birthday can be displayed as 01.01.1980 " Implementation Firstly, I thought about how to use a built-in converter likes the following. <h:inputText id="birthdate" value="#{data.birthdate}" type="date" > <f:convertDateTime/> <f:ajax event="change" listener="#{data.onCalculate}" execute="@this" render="@this" /> </h:inputText> However, without defining a pattern, JSF used its default one which was not my desire. It threw an exception when I tried to enter a date like "01.01.90". > myform:birthdate: '01.01.90' could not be understood as a date. Example: Mar 4, 2018  Actually, I even could not define either pattern "dd.MM.yyyy" or "dd.MM