18

拆分为以下代码时

String s = "12+12";
String[] sr = s.split("+");

我在 logcat 中收到此错误

09-03 15:57:22.489: E/AndroidRuntime(22029): FATAL EXCEPTION: main
09-03 15:57:22.489: E/AndroidRuntime(22029): java.util.regex.PatternSyntaxException: Syntax error in regexp pattern near index 1:
09-03 15:57:22.489: E/AndroidRuntime(22029): +
09-03 15:57:22.489: E/AndroidRuntime(22029):  ^
09-03 15:57:22.489: E/AndroidRuntime(22029):    at java.util.regex.Pattern.compileImpl(Native Method)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at java.util.regex.Pattern.compile(Pattern.java:407)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at java.util.regex.Pattern.<init>(Pattern.java:390)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at java.util.regex.Pattern.compile(Pattern.java:381)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at java.lang.String.split(String.java:1832)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at java.lang.String.split(String.java:1813)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at net.telivo.fiestacancun.ui.calllog.CallLogDetailsFragment$1.onClick(CallLogDetailsFragment.java:171)
    09-03 15:57:22.489: E/AndroidRuntime(22029):    at android.view.View.performClick(View.java:4240)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at android.view.View$PerformClick.run(View.java:17721)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at android.os.Handler.handleCallback(Handler.java:730)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at android.os.Handler.dispatchMessage(Handler.java:92)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at android.os.Looper.loop(Looper.java:137)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at android.app.ActivityThread.main(ActivityThread.java:5103)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at java.lang.reflect.Method.invokeNative(Native Method)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at java.lang.reflect.Method.invoke(Method.java:525)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-03 15:57:22.489: E/AndroidRuntime(22029):    at dalvik.system.NativeStart.main(Native Method)
4

4 回答 4

46

String#split接受一个正则表达式

如果您不想转义特殊的 char +,可以使用Pattern#quote

返回指定字符串的文字模式字符串。


String sr[] = s.split(Pattern.quote("+"));

+现在将被视为常规字符而不是元字符。

于 2013-09-03T10:32:34.600 回答
10

你应该转义这个+角色。

String s = "12+12";
String[] sr = s.split("\\+");

转义正则表达式通常由 完成\,但在 Java\中表示为\\.

于 2013-09-03T10:32:39.133 回答
5

+应该被转义,原因+是用来表示量词之一

它应该是s.split("\\+");

于 2013-09-03T10:31:43.213 回答
2

因为+ 是元字符并且在中具有特殊含义regex你必须转义那个元字符

String s = "12+12";
String[] sr = s.split("\\+");

oracle 文档在同一

于 2013-09-03T10:32:37.430 回答