Please show me how you test for each one

QUESTION 6 Which strings match the following regular expression? (must match the entire string) [hwf?at* at chat cat Sat watt ha QUESTION 7 Which strings match the following regular expression? (must match in the full string) (ahw)(at)* chat .cat watt ha QUESTION 8 cattis matched by the regular expression (h|cb)at* True False QUESTION 9 Which symbol will be used with grep command to match the pattern pat at the beginning of a line? pat Spat pats pata None of the above QUESTION 10 Which of the following commands is used to list contents of directories? dir tar None of the above QUESTION 11 cat is matched by the regular expression (Ahcbjat True False