Signed Integers
egrep ‘^[+-]?[0-9]+$’ data.txt
Floating Point Numbers
egrep ‘^[+-]?[0-9]+[.]?[0-9]*$’ data.txt
Canadian Postal Code
egrep -q ‘^[A-Z][0-9][A-Z] *[0-9][A-Z][0-9]$’ info.txt
Dec 08
Dec 08
Signed Integers
egrep ‘^[+-]?[0-9]+$’ data.txt
Floating Point Numbers
egrep ‘^[+-]?[0-9]+[.]?[0-9]*$’ data.txt
Canadian Postal Code
egrep -q ‘^[A-Z][0-9][A-Z] *[0-9][A-Z][0-9]$’ info.txt