[英]Java String.replaceAll backreference with named groups
How do you refer to named capture groups in Java's String.replaceAll
method? 您如何在Java的
String.replaceAll
方法中引用命名的捕获组?
As a simplified example of what I'm trying to do, say I have the regex 作为我要尝试做的简化示例,说我有正则表达式
\{(?<id>\d\d\d\d):(?<render>.*?)\}
which represents a tag in a string. 代表字符串中的标签。 There can be multiple tags in a string, and I want to replace all tags with the contents of the "render" capture group.
一个字符串中可以有多个标签,我想用“渲染”捕获组的内容替换所有标签。
If I have a string like 如果我有一个像
String test = "{0000:Billy} bites {0001:Jake}";
and want to get a result like "Billy bites Jake"
, I know I can accomplish my goal with 并希望获得像
"Billy bites Jake"
这样的结果,我知道我可以通过
test.replaceAll(tagRegex, "$2")
but I would like to be able to use something like 但我希望能够使用类似
test.replaceAll(tagRegex, "$render")`
Is there a way to do this? 有没有办法做到这一点? Using
"$render"
I get IllegalArgumentException: Illegal group reference
. 使用
"$render"
我得到IllegalArgumentException: Illegal group reference
。
Based on https://blogs.oracle.com/xuemingshen/entry/named_capturing_group_in_jdk7 基于https://blogs.oracle.com/xuemingshen/entry/named_capturing_group_in_jdk7
you should use ${nameOfCapturedGroup}
which in your case would be ${render}
. 您应该使用
${nameOfCapturedGroup}
,在您的情况下为${render}
。
DEMO: DEMO:
String test = "{0000:Billy} bites {0001:Jake}";
test = test.replaceAll("\\{(?<id>\\d\\d\\d\\d):(?<render>.*?)\\}", "${render}");
System.out.println(test);
Output: Billy bites Jake
输出:
Billy bites Jake
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