我尝试在Dataweave中基于regex（正则表达式）过滤输入。我有一个输入负载Array作为输入：

[
  "description_1",
  "description_2",
  "Ruimte_1",
  "_1_1_Candybar",
  "_1_2_Groceryshop",
  "description_3",
  "Ruimte_2",
  "_2_1_house1",
  "_2_1_house2"
  "description_4",
]

当我在没有正则表达式的情况下使用普通过滤器时，我会得到正确的结果：

payload filter ((item, index) -> ((item startsWith  "_1_") or (item startsWith  "_2_")))

这就是结果：

[
  "_1_1_Candybar",
  "_1_2_Groceryshop",
  "_2_1_house1",
  "_2_1_house2"
]

但问题是我可以得到任何类型的数字作为输入。所以我尝试了Regex。datawave接受一些函数的regex，但大多数时候不接受。
所以我尝试了这些替代方案：

payload filter ((item, index) -> item startsWith  (/_[0-9]_/) as Regex as String)
//return is empty

payload filter ((item, index) -> item startsWith  (/_[0-9]_/) as Regex as String)
//return is empty

payload filter ((item, index) -> item ~=  ((/_[0-9]_/) as Regex) as String)
//return is empty

payload filter ((item, index) -> item ~= /_[0-9]_/)
//return is empty

// so I tried this escaping the _:
payload filter ((item, index) -> item ~= /\_[0-9]\_/)
// nothing is returned.

我已经找到了可以胜任这项工作的东西：

payload filter ((item, index) -> item matches (/_[0-9]_[0-9]_[A-z0-9]*/))

有人有更好的解决办法吗？