A VTU (Visvesvaraya Technological University) USN (University Seat Number) is a 10-digit code to identify students.

1. First Digit:- Represents the region to which the college belongs.
2. Second and Third Digits:- Represent the college code.
3. Fourth and Fifth Digits: Represent the batch the student joined.
4. Sixth and Seventh Digits: Represent the student’s chosen course.
5. Last Three Digits: Represent the student’s roll number.
6. Set the Limit to 10 digits

RegEx : ^(([0-9]){1}([a-zA-Z]){2}([0-9]){2}([a-zA-Z]){2}([0-9]){3}){0,10}$

Example

var usn = '4GE01CS001'
var reg = '^(([0-9]){1}([a-zA-Z]){2}([0-9]){2}([a-zA-Z]){2}([0-9]){3}){0,10}$'
if(usn.match(reg)){
  console.log('true')
}else{
  console.log('false')
}