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  1. import java.io.File
  2.  
  3. fun main(args: Array<String>) {
  4.     val ptn = Regex("""(.*?)(\d+)(\.[^.]*)?""")
  5.     File(".").listFiles()
  6.         .mapNotNull { ptn.matchEntire(it.name)?.groupValues }
  7.         .forEach { File(it[0]).renameTo(
  8.         		File(it[1] + it[2].padStart(3, '0') + it[3])) }
  9. }
  10.  
Success #stdin #stdout 0.09s 34932KB
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https://ideone.com/llL3kd
language:
Kotlin (kotlin 1.3.21)
created:
4 years ago
visibility:
public

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