What is the result of this script?
txt=Penguins [[ $txt =~ [a-z]{8} ]]; echo $?
1, representing 'false', because the variable "txt" does not contain eight lowercase letters between a and z
1, representing 'false', because the variable "txt" is longer than eight characters
0, representing 'true', because everybody loves penguins!
0, representing 'true', because the variable "txt" contains eight letters