Html input type textbox pattern

Question

I have an html input type textbox , i need to restrict it by following pattern

Ex pattern :A1*A2+A3

Accepted aphanumeric character between A1-A5

1)textbox should in above pattern A alphabet followed by numeric value between 1-5
2) it should include arithmetic operators like A1+A2 *A4 and so on

Answer 1

You can achieve this either client-side or server-side.

For client-side, you can mask the HTML input using using JavaScript. Check this page for reference.

And if you need server-side, create a custom validation attributes with model data annotations. You can check this page to familiarize with the validation attributes. Then you can search how to do a custom validation attribute so that you could achieve your logical criteria for masking the input.