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val string = "one493two483three"
val pattern = """two(\d+)three""".r
pattern.findAllMatchIn(string) foreach {
   m => println(m.group(1))
   // prints 483
}

//-------------------------------------------

val string = "one493two483three"
val pattern = """(?<=two)\d+(?=three)""".r
pattern.findAllIn(string).foreach(println)
// also prints 483