As this validation is made for an email address, the validation also verifies that the address contains the "@" character followed again by characters that contain letters and/or numbers, a dot and after it more letters and/or numbers.
If using the validation shown before, when rendering the form the validation will be shown as the image below when entering a valid email address.
For an invalid email address, the warning will be shown when the event On Change() is triggered.
This property is related to the Validate property and simply sets the message error shown in case the evaluation for the field is "False".
The formula must be built inside the field that will contain the result.
Click on the "Edit" button in the "Formula" property of the text control: A modal window opens where the content of the formula must be added.
For a textbox control, if needing to store a value retrieved from a database, select from the dropdown of this property the database connection that will be used (the connection must be already created in the process, see this section to learn more about it).The properties set by default are the following: By checking this option, an asterisk is added in the label to indicate that the field is required.It means that an option must be selected mandatorily from the control.If the input matches the regular expression, then the user will be allowed to leave the field, but if the input doesn't match, the field message will be outlined in red and the text in the Validation Error Message property will be displayed.The user will not be allowed to leave the field until its input is changed to match the regular expression.