To only allow numerical data for a Multiple Textboxes question: If you add an "Other" textbox to a close-ended Multiple Choice, Dropdown, or Matrix question, you can validate that field to require respondents to enter their answer in a specific format.
For these examples we have created our own valid/invalid CSS formatting to override the browser default. That's why you may see something like the following: Before you type anything into the box a red marker is shown.
Far too many sites use regex validation and it is frustrating for many [email protected] Sorry, but you're partially wrong.
This symbols are important without them the pattern will start to match everywhere in the string and make it useless.
Perhaps it's that I'm not using regular HTML, but using React JS to render the HTML form.
This regex places a number of inappropriate requirements on email addresses -- for instance, it rejects email addresses that have a one- or two-letter username, or which are hosted at a one-letter domain name.