根据多个包含过滤List [英] filter a List according to multiple contains
本文介绍了根据多个包含过滤List的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想过滤一个 List
,只要字符串包含 .jpg
, .jpeg
或 .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
将帮助我!
需要的输出
List(a1.png,a3.png,a4.jpg,a5.jpeg)
$
解决方案使用
过滤
pre> list.filter(name => name.contains(pattern1)|| name.contains(pattern2))
如果您有未定义的扩展数量:
val extensions = List jpg,png)
list.filter(p => extensions.exists(e => p.matches(s。* \\。$ e $$)))
I want to filter a List
, only wants if string contains .jpg
,.jpeg
or .png
scala> var list = List[String]("a1.png","a2.amr","a3.png","a4.jpg","a5.jpeg","a6.mp4","a7.amr","a9.mov","a10.wmv")
list: List[String] = List(a1.png, a2.amr, a3.png, a4.jpg, a5.jpeg, a6.mp4, a7.amr, a9.mov, a10.wmv)
i am not finding that .contains
will help me!
required output
List("a1.png","a3.png","a4.jpg","a5.jpeg")
解决方案
Use filter
method.
list.filter( name => name.contains(pattern1) || name.contains(pattern2) )
If you have undefined amount of extentions:
val extensions = List("jpg", "png")
list.filter( p => extensions.exists(e => p.matches(s".*\\.$e$$")))
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