^0 零
1 一
2 二
3 三
4 四
5 五
6 六
7 七
8 八
9 九
1(\d) 十$1
(\d)(\d) $1十$2
1(\d\d) 百$1
(\d)(\d\d) $1百$2
1(\d\d\d) 千$1
(\d)(\d\d\d) $1千$2
(\d{1,4})(\d{4}) $1万$2
(\d{1,4})(\d{8}) $1億$2
(\d{1,4})(\d{12}) $1兆$2
(\d{1,4})(\d{16}) $1京$2
(\d{1,4})(\d{20}) $1垓$2
(\d{1,4})(\d{24}) $1秭$2
(\d{1,4})(\d{28}) $1穣$2
(\d{1,4})(\d{32}) $1溝$2
(\d{1,4})(\d{36}) $1澗$2
(\d{1,4})(\d{40}) $1正$2
(\d{1,4})(\d{44}) $1載$2

# negative numbers?

[-−](\d+) 负|$1

# decimals?

"([-−]?\d+)[.,]" "$1・"
"([-−]?\d+[.,]\d*)(\d)" $1||$2

# currency

# unit/subunit singular/plural

JPY 円

"([A-Z]{3}) ([-−]?\d+([.,]\d+)?)" $2$1

# formal numbers (大字) for legal and financial documents

== formal ==

^0 零
1 壱
2 弐
3 参
4 四
5 五
6 六
7 七
8 八
9 九
1(\d) 拾$(formal \1)
(\d)(\d) $(formal \1)拾$(formal \2)
1(\d\d) 百$(formal \1)
(\d)(\d\d) $(formal \1)百$(formal \2)
1(\d\d\d) 千$(formal \1)
(\d)(\d\d\d) $(formal \1)千$(formal \2)
(\d{1,4})(\d{4}) $(formal \1)万$(formal \2)
(\d{1,4})(\d{8}) $(formal \1)億$(formal \2)
(\d{1,4})(\d{12}) $(formal \1)兆$(formal \2)
(\d{1,4})(\d{16}) $(formal \1)京$(formal \2)
(\d{1,4})(\d{20}) $(formal \1)垓$(formal \2)
(\d{1,4})(\d{24}) $(formal \1)秭$(formal \2)
(\d{1,4})(\d{28}) $(formal \1)穣$(formal \2)
(\d{1,4})(\d{32}) $(formal \1)溝$(formal \2)
(\d{1,4})(\d{36}) $(formal \1)澗$(formal \2)
(\d{1,4})(\d{40}) $(formal \1)正$(formal \2)
(\d{1,4})(\d{44}) $(formal \1)載$(formal \2)

# negative numbers?

[-−](\d+) 负|$(formal \1)

# decimals

"([-−]?\d+)[.,]" "$(formal \1)・"
"([-−]?\d+[.,]\d*)(\d)" $(formal \1)||$(formal \2)

# currency

# unit/subunit singular/plural

JPY 円

"([A-Z]{3}) ([-−]?\d+([.,]\d+)?)" $(formal \2)$(formal \1)

== help ==

"" |$(1)|, |$(2)|, |$(3)|\n$(help formal)
(formal) \1: |$(\1 1)|, |$(\1 2)|, |$(\1 3)|\n