Kotlin parsing String path knowledge

Parse String path, simple knowledge is stable

fun main(args: Array) {
val url = “/users/yole/kotlin-book/chapter.doc”
fun prasePath(path : String){
//The part before the last specified string is all saved
val a = path.substringBeforeLast("/")
println(a)
//The last oneAfter the specified string, it is the file name
val b = path.substringAfterLast("/")
println(b)
//String. Before is the file name
val fileName = b.substringBeforeLast(".")
//String. After that is the extension
println(fileName)
val extension = b.substringAfterLast(".")
println(extension)
}
//Create a method for parsing file paths using regular expressions
fun parsePath1(path:String){
//Create a regular expression
//(.+)/ The string before the last slash (.+)\The last .(.+) suffix name
val regex = """(.+) /(.+).(.+)""".toRegex()
println(regex)
//match
val matchResult = regex.matchEntire(path)
println(matchResult)
//Parse
if(matchResult !=null){
val (a,b,c) = matchResult.destructured
println(“a:$a,name$b,ext:$c”)
println(a)
}
}
prasePath(url)
parsePath1(url)
}

The output is as follows:
/users/yole/kotlin-book
chapter.doc
chapter
doc
The following is the printed result of the regular expression parsing
(.+)/(.+).(.+)
[email protected]
a:/users/yole/kotlin-book,namechapter,ext:doc
/users/yole/kotlin-book