Can we validate .0 using regex

Question

I'm doing a field that will only accept whole numbers. So I did a regex validation like this /^\\d{1,3}$/ this is validating whole number entry and does not allow decimal from .1 eg it will make 1.1 invalid but when I tried to input 1.0 it accepted it. Is there a regex that will also check .0?

Answer 1

^\\d{1,3}(\\.0)?$接受一，两位或三位数的整数以及它们以.0结尾的数字。