我有以下简单的应用程序:
object TestPatternMatch extends App {
if (args.length != 1)
throw new IllegalArgumentException("takes one argument which is a regex string that will be used to limit the org deletion")
val pattern = args(0).r
println("looking for orgs with name matching regex: " + pattern)
val orgs = Seq("zephyr-test-123", "abcdef", "zephyr-test-xyz-xyz-xyz")
orgs.foreach {
_ match {
case pattern(x) ⇒ println("matched " + x)
case y ⇒ println("failed to match " + y)
}
}
}
当我在下面打电话时,我期待在第一和第三组织上匹配。我错过了什么?
[info] Running TestPatternMatch zephyr-test-.*
looking for orgs with name matching regex: zephyr-test-.*
failed to match zephyr-test-123
failed to match abcdef
failed to match zephyr-test-xyz-xyz-xyz
答案 0 :(得分:8)
您的模式不包含匹配()
组的x
。
val R0 = "zephyr-test-.*".r
val R0() = "zephyr-test-123" // matches, with no assignments
val R0(x) = "zephyr-test-123" // MatchError, nothing to bind `x` to
val R1 = "zephyr-test-(.*)".r
val R1(x) = "zephyr-test-123" // matches, x = "123"