Question

这是我的数据的一个示例：

case time (especially it's purse), read manual care, follow care instructions make stays waterproof -- example, inspect rubber seals doors (especially battery/memory card door open time) 
xm "life support" picture . flip part bit flimsy guessing won't long . sound great altec speaker dock it! chance back base (xm3020) . traveling bag connect laptop extra speaker . amount paid ($25).

我想删除除点（。）以外的所有标点符号，并删除带有length < = 2的字词，例如我的预期输出为：

case time especially its purse read manual care follow care instructions . make stays waterproof example inspect rubber seals doors especially batterymemory card door open time
life support picture . flip part bit flimsy guessing wont long . sound great altec speaker dock chance back base xm3020 . traveling bag connect laptop extra speaker . amount paid $25 .

这应该在Scala中实现，我试过了：

replaceAll( """\\W\s""", "")
replaceAll(""""[^a-zA-Z\.]""", "")

但效果不好，有人能帮帮我吗？

Answer 1

查看正则表达式javadoc（http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html），我们看到标点符号的字符类是\p{Punct}，我们可以使用[a-z&&[^def]]之类的东西从字符类中删除字符。从那时起，很容易定义一个正则表达式，它将删除除点之外的所有标点符号：

s.replaceAll("""[\p{Punct}&&[^.]]""", "")

删除大小为＆lt; = 2的单词可以这样做：

s.replaceAll("""\b\p{IsLetter}{1,2}\b""")

结合这两者，这给出了：

s.replaceAll("""([\p{Punct}&&[^.]]|\b\p{IsLetter}{1,2}\b)\s*""", "")

请注意我添加\s*以删除多余空格。

此外，您可以看到上述正则表达式完全删除了＆＃39; $＆＃39;，因为是一个标点字符（由unicode定义）。如果这是不合需要的（似乎表明您的预期输出），请更准确地考虑标点符号。例如，您可能只想将以下字符视为标点符号：?.!:()：

s.replaceAll("""([?.!:]|\b\p{IsLetter}{1,2}\b)\s*""", "")

或者，你可以添加＆＃39; $＆＃39;你的＆＃34; not-punctuation＆＃34;字符列表，以及点：

s.replaceAll("""([\p{Punct}&&[^.$]]|\b\p{IsLetter}{1,2}\b)\s*""", "")

Answer 2

这个怎么样：

replaceAll("(\\(|\\)|'|/", "")

然后你只需添加更多标点符号来删除使用|，并确保使用双反斜杠转义像（和）这样的字符？

Answer 3

您可以尝试过滤字符串，如下所示：

val example = "Hey there! It's me, myself and I."
example.filterNot(x => x == ',' || x == '!' || x == 'm')
 res3: String = Hey there It's e yself and I.

Answer 4

试试这个，它应该有效：

val str = """
  |case time (especially it's purse), read manual care, follow care instructions make stays waterproof -- example, inspect rubber seals doors (especially battery/memory card door open time) 
  |xm "life support" picture . flip part bit flimsy guessing won't long . sound great altec speaker dock it! chance back base (xm3020) . traveling bag connect laptop extra speaker . amount paid ($25).
  """.stripMargin('|')

println(str)
val pat = """[^\w\s\.\$]"""
val pat2 = """\s\w{2}\s"""
println(str.replaceAll(pat, "").replaceAll(pat2, ""))

输出：

case time especially its purse read manual care follow care instructions make stays waterproof  example inspect rubber seals doors especially batterymemory card door open time 
life support picture . flip part bit flimsy guessing wont long . sound great altec speaker dockchance back base xm3020 . traveling bag connect laptop extra speaker . amount paid $25.

删除标点符号在Scala - Spark中形成文本

4 个答案: