# 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