根据多个包含过滤列表 [英] filter a List according to multiple contains

问题描述

我想过滤一个List，如果字符串包含.jpg、.jpeg或<，我只想保留一个字符串代码>.png:

I want to filter a List, and I only want to keep a string if the string contains .jpg,.jpeg or .png:

scala>  var list = List[String]("a1.png","a2.amr","a3.png","a4.jpg","a5.jpeg","a6.mp4","a7.amr","a9.mov","a10.wmv")
list: List[String] = List(a1.png, a2.amr, a3.png, a4.jpg, a5.jpeg, a6.mp4, a7.amr, a9.mov, a10.wmv)

我没有发现 .contains 会帮助我！

I am not finding that .contains will help me!

所需的输出:

List("a1.png","a3.png","a4.jpg","a5.jpeg")

推荐答案

使用 filter 方法.

list.filter( name => name.contains(pattern1) || name.contains(pattern2) )

如果您有未定义的扩展数量:

If you have undefined amount of extentions:

val extensions = List("jpg", "png")
list.filter( p => extensions.exists(e => p.matches(s".*\.$e$$")))

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