为什么此Java String.replaceAll（）code不工作？ [英] Why does this Java String.replaceAll() code not work?

问题描述

我用string.replaceAll（）在Java中，没有麻烦过，但我难倒在这一个。我认为这将只是简单地工作，因为没有/或$字符。这里是我想要做的：

I have used string.replaceAll() in Java before with no trouble, but I am stumped on this one. I thought it would simply just work since there are no "/" or "$" characters. Here is what I am trying to do:

String testString = "__constant float* windowArray";
String result = testString.replaceAll("__constant float* windowArray", "__global float* windowArray");

变量的结果最终看起来一样的TestString。我不明白为什么没有任何改变，请大家帮忙。

The variable result ends up looking the same as testString. I don't understand why there is no change, please help.

推荐答案

传递的replaceAll的第一个参数仍被视为一个普通的前pression。在 * 字符是一个特殊字符的含义，大致的$ P $字符串（在这里pvious件事： T ），可以是有0个或更多次。你想要做的就是逃避 * 为常规的前pression。你的第一个参数应该看起来更像是：

The first argument passed to replaceAll is still treated as a regular expression. The * character is a special character meaning, roughly, the previous thing in the string (here: t), can be there 0 or more times. What you want to do is escape the * for the regular expression. Your first argument should look more like:

"__constant float\\* windowArray"

第二个参数是，你的目的，还只是一个普通的字符串，至少，让你不必逃避 * 那里。

String result = testString.replaceAll("__constant float\\* windowArray", "__global float* windowArray");

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