How to change .txt file extension to .xml file extension using regular expression?

Question

String FileName= vars.get(''resultspath" + "/" + vars.get("path") + "/" + props.get("") +"/" + Vars.get("Name")

输出文件的格式为“ Name.txt”，我希望将其更改为“ Name.xml”，如何使用正则表达式进行更改。

Answer 1

You can use split, assuming file name doesn't contain '.'

String s ="Name.txt";
s = s.split("\\.")[0]+".xml";

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Another, solution could be using replaceAll , in this case, it doesn't matter whether filename contains '.' or not.

s = s.replaceAll("\\.txt$",".xml");

Answer 2

You can use something like String changedName = fileName.replaceAll(".txt$", ".xml"); That way, .txt in the end of file name will be changed to .xml (Note $ after .txt ), and it works even if the file name contains . somewhere else

Answer 3

In JavaScript it would be something like this:

"Name.txt".replace(/\.txt$/, '.xml');

In Java, you can do it like this:

"Name.txt".replaceFirst("\\.txt$", ".xml");