在Scala中使用正则表达式的字符串格式

Question

I have a String in the format of "20150403" and I want to convert it into the format of string like "2015-04-03". Is there any way using regular expression and string format in Scala?

Answer 1

Here is a sample

val date = """(\d{4})(\d{2})(\d{2})""".r
val date(year, month, day) = "20150402"
println(s"$year-$month-$day") // 2015-04-02

Answer 2

Regex is slow. For this u need not use regex , u can use string.substring .

val today="20150403"
val out=today.substring(0,4)+"-"+today.substring(4,6)+"-"+today.substring(6)