主页 / 问题 / 607413
Accepted
Evgeniy
Asked:2020-12-24 23:29:40 +0000 UTC2020-12-24 23:29:40 +0000 UTC

调用 replaceAll() 时出现 PatternSyntaxException

  • 772

有一段代码：

String[] del = {"\"", "\'", ",", ".", ";", "`", ":", "!", "(", ")", "<", ">", "-", "_"};

for (String delElement : del) {
    word = word.replaceAll(delElement, "");
}

在编译期间抛出 PatternSyntaxException：

Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed group near index 1
(
 ^
at java.util.regex.Pattern.error(Pattern.java:1955)
at java.util.regex.Pattern.accept(Pattern.java:1813)
at java.util.regex.Pattern.group0(Pattern.java:2908)
at java.util.regex.Pattern.sequence(Pattern.java:2051)
at java.util.regex.Pattern.expr(Pattern.java:1996)
at java.util.regex.Pattern.compile(Pattern.java:1696)
at java.util.regex.Pattern.<init>(Pattern.java:1351)
at java.util.regex.Pattern.compile(Pattern.java:1028)
at java.lang.String.replaceAll(String.java:2223)
at WordCounter.main(WordCounter.java:20)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

我该如何解决？

java

2 个回答

  1. Best Answer

    replaceAll由于该方法将正则表达式作为第一个参数，因此被(认为是特殊的。字符（作为组的开头等）。所以需要屏蔽。也一样)。此外，.在正则表达式中，它匹配任何字符，因此.replaceAll(".", "")结果为空字符串。

    String[] del = { "\"", "\'", ",", "\\.", ";", "`", ":", "!", "\\(", "\\)", "<", ">", "-", "_" };
String word = "abc\"',.;`:!()<>-_def";
for (String delElement : del)
{
    word = word.replaceAll(delElement, "");
}
System.out.println(word);

    自注册以来。表达式，那么您可以将所有要排除的元素合并到一个表达式中，以便只生成一个replaceAll. 但是，此选项的可读性差别不大：

    String del = "[\"',\\.;`:!\\(\\)<>\\-_]";
String word = "abc\"',.;`:!()<>-_def";
word = word.replaceAll(del, "");
System.out.println(word);
    • 1

  2. 试试这样：

    String[] del = {"\"", "\'", ",", ".", ";", "`", ":", "!", "(", ")", "<", ">", "-", "_"};

for (String delElement : del) 
        word = word.replaceAll(Pattern.quote(delElement), "");
    • 0

相关问题