Having trouble with regular expressions

[mikla]

Hi I am a new python learner, having some difficulty with regular expressions

import re

x='trash bag 19th of July 1.456 3x times 20 juice'

y=re.findall('[0-9]+[0-9]',x)

print(y)

Here is the result: ['19','456','20']

I was doing some testing looking to understand regular expressions, I wrote the code and I thought it would not retrieve any numbers. When I run the code, why does it retrieve them? The way I wrote it, I thought that if a number is not followed by another number it wouldn't be retrieved.

Do I understand this correctly: "is 1 a number? yes. is 9 a number? yes. is "t" a number"? no -> no match

I also don't understand it retrieves the "19" but does not retrieve "1".

Sorry if this is a stupid question, I'm really new at this