Taiwan Phone Number formater

sed_file

# Cellphone and 080X-XXX-XXX free/paid phone number
s/^09[0-9][0-9]/&-/g; s/^09[0-9][0-9]-[0-9][0-9][0-9]/&-/g;
s/^0[1-7]0/_&-/g;
s/^080[0-9]/&-/g; s/^080[0-9]-[0-9][0-9][0-9]/&-/g;

# ref: https://zh.wikipedia.org/wiki/中華民國長途電話區號表
# normal home phone number
s/^037/(037) /g;
s/^049/(&) /g;
s/^0826/(&) /g;
s/^082/(&) /g;
s/^0836/(&) /g;
s/^089/(&) /g
s/^0[2-8]/(&) /g;
# last four digital always in same group
s/[0-9][0-9][0-9][0-9]$/-&/g

# 070 not region code, remove them
s/^_//g

test.sh

echo 0212341234 | sed -f sed_file
echo "(02) 1234-1234"

echo 031231234 | sed -f sed_file
echo "(03) 123-1234"

echo 037121234 | sed -f sed_file
echo "(037) 12-1234"

echo 0412341234 | sed -f sed_file
echo "(04) 1234-1234"

echo 047121234 | sed -f sed_file
echo "(04) 712-1234"

echo 048121234 | sed -f sed_file
echo "(04) 812-1234"

echo 0491231234 | sed -f sed_file
echo "(049) 123-1234"

echo 051231234 | sed -f sed_file
echo "(05) 123-1234"

echo 061231234 | sed -f sed_file
echo "(06) 123-1234"

echo 071231234 | sed -f sed_file
echo "(07) 123-1234"

echo 081231234 | sed -f sed_file
echo "(08) 123-1234"

echo 089121234 | sed -f sed_file
echo "(089) 12-1234"

echo 082121234 | sed -f sed_file
echo "(082) 12-1234"

echo 0826 | sed -f sed_file
echo "(0826)"

echo 083611234 | sed -f sed_file
echo "(0836) 1-1234"

echo 0900123123 | sed -f sed_file
echo "0900-123-123"

echo 0800123123 | sed -f sed_file
echo "0800-123-123"

echo 07012341234 | sed -f sed_file
echo "070-1234-1234"