I added one line to get up to 10 digits starting from the right side. This will remove the leading "1" and I think any country code. (I'm assuming the phone number is in the format for Canada/USA.)
while(<DATA>) {
s/[^\d]+//g; # remove non-digit characters
# only digit characters remain
m/(.{0,10})$/; # find as many as 10 characters,
# starting at the right
print $1,$/; # print the found digits
}
__DATA__
800-1212
1-800-800-1212
1(800)800-1212
1 (800) 800-1212
1 800 800 1212
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