I have a problem trying to find out what my username and password are.
I have a challenge to ask and they ask me to find my username and password based on a clue given by the following regular expression:
[1-3]{0,4}
Which gives me an intendity number that I think serves as a clue as well to be able to determine the answer:
2035645013
I searched but could not find anything that could help me.
How could I do this?
The expression:
[1-3]{0,4}
It means: a succession of between no and 4 numbers, all of them between 1 and 3.
This means that the following values comply:
# nada
1
123
111
1111
etc.
Now, given:
2035645013
We must go exploring what combinations have it:
2035645013
^ ^^
Looking at it well, we note that there are only two possible sequences:
2 # números entre 1 y 3, 1 vez
13 # números entre 1 y 3, 2 veces
Therefore the solution is that it is either 2 or 13 . Maybe the username is 2 and password 13?
Well, when you apply that regular expression to the number they gave you, you get:
2313
and the remaining numbers are:
056450