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