Question

How to extract all numbers from a string into a list in Scala

Answer 1

import scala.util.matching.Regex

object Main extends App {
  val str = "abc87def1009g15hi3"

  val re: Regex = "[0-9]+".r

  val lst = re.findAllIn(str).toList
  
  println(lst)
}
 
   
/*
           
run:
     
List(87, 1009, 15, 3)
       
*/

 

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Answer 2

import scala.util.matching.Regex

object Main extends App {
  val str = "abc87def1009g15hi3"

  val lst = ("""\d+""".r findAllIn str).toList
  
  println(lst)
}
 
   
/*
           
run:
     
List(87, 1009, 15, 3)
       
*/

 

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Answer 3

import scala.util.matching.Regex

object Main extends App {
  val str = "abc87def1009g15hi3"

  val lst = str.split("\\D+").filter(_.nonEmpty).toList
  
  println(lst)
}
 
   
/*
           
run:
     
List(87, 1009, 15, 3)
       
*/

 

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