String的replaceAll方法的奇怪行为 [英] Strange Behaviour of replaceAll method of String

问题描述

我正面临 String 类的 replaceAll 方法的奇怪行为.

I am facing strange behaviour of replaceAll method of String class.

我有一个包含以下数据的字符串缓冲区

I have a string buffer which contain below data

keyRPT1={keyRPT11=01|keyRPT19=01}|keyRPT3={keyRPT11=03|keyRPT19=01}|keyRPT8={keyRPT11=08|keyRPT19=01}

我编写下面的代码将"keyRPT11=08|keyRPT19=01"替换为"keyRPT11=08|keyRPT19=2"

i write below code to replace the "keyRPT11=08|keyRPT19=01" with "keyRPT11=08|keyRPT19=2"

我正在使用下面的代码

String complementaryInformation = "keyRPT1={keyRPT11=01|keyRPT19=01}|keyRPT3={keyRPT11=03|keyRPT19=01}|keyRPT8={keyRPT11=08|keyRPT19=01}";

complementaryInformation = complementaryInformation.replaceAll("keyRPT11=08|keyRPT19=01","keyRPT11=08|keyRPT19=2");

replaceAll 给我意想不到的输出

replaceAll give me the unexpected output

keyRPT1={keyRPT11=01|keyRPT11=08|keyRPT19=2}|keyRPT3={keyRPT11=03|keyRPT11=08|keyRPT19=2|keyRPT8={keyRPT11=08|keyRPT19=2|keyRPT11=08|keyRPT19=2}

当我使用替换方法时，我会得到正确的输出

when i am using replace method then i'll get the right output

keyRPT1={keyRPT11=01|keyRPT19=01}|keyRPT3={keyRPT11=03|keyRPT19=01}|keyRPT8={keyRPT11=08|keyRPT19=2}

有什么想法吗??

推荐答案

您需要对 | 符号进行转义，该符号在正则表达式中具有特殊含义.

You need to escape the | symbol which has special meaning in regex.

complementaryInformation = complementaryInformation.replaceAll("keyRPT11=08\\|keyRPT19=01","keyRPT11=08|keyRPT19=2");

replaceAll() 方法将正则表达式模式作为第一个参数.replace() 方法不以正则表达式为参数.

replaceAll() method takes regex pattern as first parameter. replace() method does not take regex as parameter.

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