在Java中使用正则表达式替换字符

Question

I have a String where a substring with third bracket can contain like that

String str = "merSampleFactoryList[0].tfSendDate.fields[0].durationField.supported";

I want to replace all [0] , [1] , [2] ...... with " [] " . I know i can do it using regular expression but don't know how to do that.

Answer 1

You can use String::replaceAll with regex \\[.*?\\] :

str = str.replaceAll("\\[.*?\\]", "[]")

Output

merSampleFactoryList[].tfSendDate.fields[].durationField.supported

regex demo

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Note

In case you want to replace only the bracket which contains integers then you can use \\[\\d+\\] instead.

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Or like @Dukeling mention in comment you can use \\[[^]]*\\] instead of \\[.*?\\]

regex demo 2