why the output have assitanc;instead,of assistance?

Question

pattern = r"([\w\.-]+)@([\w\.-]+)(.[\w\.])+"
str = "Please contact [e-mail] for assistance"

match = re.search(pattern, str)
if match:
print(match.group())
output: [e-mail] for assistanc

Answer 1

At first I did not understand why happens this. To understand I put the regex and text in this page https://regexr.com/.
It gave the same result. Finally I see that last group represents words of 2 characters and then "+" means 1 o more. If you count from the characters from " for" to the last letter "e" that is odd. so the solution put another "." before the last "[ ]":([\w\.-]+)@([\w\.-]+)(..[\w\.])

Answer 2

here the code, in the final part of the regex a \w* was added. https://code.sololearn.com/cjyZH1vsuggd/?ref=app