the single quote in howl' is fine because you've used double quotes to mark the beginning and end of the string multiline strings allow you to use newlines in strings without the \ escape character the expressions evaluate to the following' 'hello'hello'loworld the expressions evaluate to the following'hellotrue 'hello the expressions evaluate to the following['remember,''remember,''the''fifth''of''november ''there-can-be-only-one the rjust()ljust()and center(string methodsrespectively the lstrip(and rstrip(methods remove whitespace from the left and right ends of stringrespectively the re compile(function returns regex objects raw strings are used so that backslashes do not have to be escaped the search(method returns match objects the group(method returns strings of the matched text group is the entire matchgroup covers the first set of parenthesesand group covers the second set of parentheses periods and parentheses can be escaped with backslash\(and \ if the regex has no groupsa list of strings is returned if the regex has groupsa list of tuples of strings is returned the character signifies matching "eitherorbetween two groups the character can either mean "match zero or one of the preceding groupor be used to signify non-greedy matching the matches one or more the matches zero or more the { matches exactly three instances of the preceding group the { , matches between three and five instances the \ \wand \ shorthand character classes match single digitwordor space characterrespectively the \ \wand \ shorthand character classes match single character that is not digitwordor space characterrespectively appendix