Question

我有一个像这样的字符串

result: String = /home/administrator/com.supai.common-api-1.8.5-DEV-    SNAPPSHOT/com/a/infra/UserAccountDetailsMetaData$.class
/home/administrator/com.supai.common-api-1.8.5-DEV-    SNAPSHOT/com/a/infra/UserAccountDetailsMetaData.class
/home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/UserAccountMetaData$.class
/home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/UserAccountMetaData.class
/home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/UserOverridenFunctionMetaDataMetaData$.class
/home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/UserOverridenFunctionMetaDataMetaData.class
/home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/UserOverridenPermissionMetaData$.class
/home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/UserOverridenPermissionMetaData.class
/home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/UserRoleMetaData$.class
 /home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/UserRoleMetaData.class
/home/administrator/com.supai.common-api-1.8.5-DEV- SNAPSHOT/com/a/infra/VendorAddressMetaData$.class
/home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/VendorAddressMetaData.class
 /home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/reactore/infra/VendorContactMetaData$.class
/home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/reactore/infra/VendorContactMetaData.class
  /home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/reactore/infra/VendorMetaData$.class
  /home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/VendorMetaData.class
  /home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/WeekMetaData$.class
  /home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/WeekMetaData.class
 /home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/WorkflowMetadataMetaData$.class
 /home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/WorkflowMetadataMetaData.class
/home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/WorkflowNotificationMetaData$.class
/home/administrator/com.supai.common-api-1.8.5-DEV-SNAPSHOT/com/a/infra/WorkflowNotificationMetaData.class
 /home/a/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
 /home/a/usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar
/home/common/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
/home/raghav/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
/home/sysadmin/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
/home/tmp/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
/home/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
/home/usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar
/usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar
regex: scala.util.matching.Regex = (\\/([u|s|r])\\/([s|h|a|r|e]))
x: scala.util.matching.Regex.MatchIterator = empty iterator`

并且我不知道如何只得到这个部分/usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar，这部分可以在字符串中的任何地方，我怎样才能实现这一点，我尝试在Scala中使用正则表达式但不知道如何使用正斜杠，所以任何人都可以解释如何在scala中执行此操作。

Answer 1

您的搜索条件是什么？你的模式似乎是错误的。在您的rexexp中，我看到u|s|r表示要搜索u，或 s 或 r。有关详细信息，请参阅here

我怎么才能得到这个部分 /usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jarand 这部分可以在字符串中的任何位置

如果您正在寻找路径，请参阅以下示例：

scala> val input = """/home/common/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
     |     /home/raghav/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
     |     /home/sysadmin/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
     |     /home/tmp/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
     |     /home/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
     |     /home/usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar
     |     /usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar"""
input: String =
/home/common/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
    /home/raghav/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
    /home/sysadmin/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
    /home/tmp/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
    /home/usr/share/common-api/lib/com.supai.common-api-1.3-SNAPSHOT.jar
    /home/usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar
    /usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar

scala> val myRegExp = "/usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar".r
myRegExp: scala.util.matching.Regex = /usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar

scala> val myRegExp2 = "helloWorld.jar".r
myRegExp2: scala.util.matching.Regex = helloWorld.jar
scala> (myRegExp findAllIn input) foreach( println)
/usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar
/usr/share/common-api/lib/com.supai.common-api-1.8.5-DEV-SNAPSHOT.jar

scala> (myRegExp2 findAllIn input) foreach( println)

scala>

scala中的正则表达式匹配字符串

1 个答案: