Using the “Role Explorer” in Microsoft Dynamics 365 Business Central, you can get an overview of the features available to your Role. Each of the “Role Explorer” elements is an action, and a means to navigate Microsoft Dynamics 365 Business Central (I have heard this many times referred to as a “menu”).
Elements can be added to the “Role Explorer” by extending the Role Center being viewed. The following snippet is an example that extends the Business Manager Role to add an action that opens a page.

pageextension 50101 "Business Manager Ext" extends "Business Manager Role Center"
{
    actions
    {
        addafter(Deposits2)
        {
            action(MyCustomerList)
            {
                ApplicationArea = Basic, Suite;
                Caption = 'My Customer List';
                Image = Customer;
                Promoted = true;
                PromotedCategory = Process;
                RunObject = Page "Customer List";
                ToolTip = 'Display Customer List';
            }
        }
    }
}

Note: The code listed in this article is for demonstration purposes only 

When accepting user input in a field, it may be necessary to validate that the value matches a particular pattern. In early versions of Microsoft Dynamics NAV, you could use the RegEx dotNet libraries to validate input against a regular expression.

The RegEx dotNet libraries are not directly available in Dynamics 365 Business Central; however, there is a RegEx Codeunit that provides functionality to use regular expressions to match text patterns. The RegEx Codeunit implements an IsMatch procedure, which you can use to validate a value against a Regular Expression.
For example, to match a pattern of three alphabetic characters followed by a hyphen and then any three alphanumeric characters (Good: ABC-D1Q, Bad: 123-ADS), the following RegEx example implementation demonstrates the use of the IsMatch procedure:

 Adjust the pattern and code to satisfy your requirements. Text version of code listed below.

field(50101; "DVLPR RegEx Code"; Code[20])
        {
            Caption = 'RegEx Code';
            DataClassification = CustomerContent;

            trigger OnValidate()
            var
                Matches: Record Matches;
                Regex: Codeunit Regex;
                Pattern,
                Value : Text;
            begin
                Pattern := '[A-Z]{3}\-[0-9,A-Z]{3}

                if Regex.IsMatch("DVLPR RegEx Code", Pattern, 0) then
                    Message('Match')
                else
                    Error('No Match');
            end;
        }

Note: The code listed in this article is for demonstration purposes only