What attribute can you use to specify a regular expression which describes a valid value for an input element?

Answer 1

In which technology ?

Answer 2

Sounds like you are talking about an HTML input element?

If so it would be the `pattern` attribute:
https://www.w3schools.com/tags/att_input_pattern.asp

Answer 3

Gaurav Singh see this code. It generates a regex from a given text:https://code.sololearn.com/c9bMO7j9R5J8/?ref=app