##leetcode 193 ```bash sed -n ‘/^([0-9]{3}-){2}[0-9]{4}$/p;/^([0-9]{3}) [0-9]{3}-[0-9]{4}$/p’ file.txt
Valid Phone Numbers
Jun 5, 2016
Jun 5, 2016
##leetcode 193 ```bash sed -n ‘/^([0-9]{3}-){2}[0-9]{4}$/p;/^([0-9]{3}) [0-9]{3}-[0-9]{4}$/p’ file.txt