Could u plz Explain this Code what happening here ?

Question

Code 1:
pat =re.compile(r'(\w+) (\w+)')
pat.search("hello world")
O/P:<_sre.SRE_Match object; span=(0, 11), match='hello world'>

code 2:
pat =re.compile(r'(\w) (\w)')
pat.search("hello world")
O/P:<_sre.SRE_Match object; span=(4, 7), match='o w'>

In Above regular Expression codes ,
First Code pattern Alphanumeric with one or more character <white space> another one alpnum value
it returns Hello World as Output

But in Second Code i place Expression As (\w) it allows only one alphanum value so it gives
output : o(form hello) w (from world)
my question y last char return from hello and 1st char return from World

Answer 1

I think it is because....
if the pattern is
'2 characters separated by a space',
the only substring matching this in "hello world"
is indeed "o w"