Words and regex

Questions 1 to 5 of 8

1. 1. What does this program print? ``python print(' x y '.split(' ')) ``

   ['x', 'y']['', '', 'x', '', 'y', '']['', 'x', '', 'y']['', '', 'x', 'y', '']
2. 2. Which regex piece matches exactly one digit from 0 to 9? Write it as it appears inside a raw string, without the r and the quotes.

   Type your answer.

3. 3. Without the r prefix, how many backslash characters must you type in a Python string literal to get one backslash into the pattern? Give the number.

   Type your answer.

4. 4. Why does this call return None? ``python import re print(re.fullmatch(r'\d{3}-\d{4}', 'call 555-1234 now')) ``

   None, because fullmatch needs the whole text to match, and the words call and now are not covered by the patternNone, because the dash is not allowed in a phone numberNone, because \d{4} needs four letters, not digitsA match object, because the pattern finds the number anywhere in the text
5. 5. What does this program print? ``python import re print(re.sub(r'\d+', '#', 'order 17 shipped, order 204')) ``

   order 17 shipped, order 204order # shipped, order 204order ## shipped, order ###order # shipped, order #