Java String ReplaceAll方法给出非法重复错误？ [英] Java String ReplaceAll method giving illegal repetition error?

问题描述

我有一个字符串，当我尝试运行 replaceAll 方法时，我收到了这个奇怪的错误：

I have a string and when I try to run the replaceAll method, I am getting this strange error:

String str = "something { } , op";
str = str.replaceAll("o", "\n"); // it works fine
str = str.replaceAll("{", "\n"); // does not work

我收到一个奇怪的错误：

and i get a strange error:

Exception in thread "main" java.util.regex.PatternSyntaxException:
Illegal repetition {  

如何替换{？

推荐答案

{是用于范围重复的正则表达式元字符 {min，max } 。要匹配文字 {，您需要通过前面的 \\ 来逃避它：

A { is a regex meta-character used for range repetitions as {min,max}. To match a literal { you need to escape it by preceding it with a \\:

str = str.replaceAll("\\{", "\n"); // does work

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