你如何在java正则表达式中逃避美元和大括号（即$ {title}）？ [英] How do you escape dollar and braces, (i.e. ${title}) in a java regular expression?

问题描述

即如何做到这一点？

String string = "Sample string with ${title} to be inserted.";
string.replaceAll("${title}", title);

以下所有结果均出现错误：

All of the following results in an error:

string.replaceAll("\\${title}", title);
string.replaceAll("\\\\${title}", title);
string.replaceAll("\\\\$\\{title\\}", title);

而且，似乎没有任何效果，这一切都会导致如下错误：

And more, nothing seems to work, it all results in an error like this:

java.util.regex.PatternSyntaxException: Illegal repetition near index 4 \\$\\{title\\}
    at java.util.regex.Pattern.error(Pattern.java:1713)
    at java.util.regex.Pattern.closure(Pattern.java:2775)
    at java.util.regex.Pattern.sequence(Pattern.java:1889)
    at java.util.regex.Pattern.expr(Pattern.java:1752)

推荐答案

不确定最后一个会导致错误;它只是不匹配任何东西，因为你在 $ 上使用了太多的反斜杠。

Not sure how the last one would result in an error; it'd just not match anything because you're using too many backslashes on the $.

这应该有效：

string.replaceAll("\\$\\{title\\}", title);

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