Java Regex:提取版本号 [英] Java Regex: Extracting a Version Number

问题描述

我有一个程序，将版本号存储在文件系统上的文本文件中.我在java中导入了文件，并且想要提取版本号.我对正则表达式不太满意，因此希望有人能提供帮助.

I have a program that stores the version number in a text file on the file system. I import the file within java and I am wanting to extract the version number. I'm not very good with regex so I am hoping someone can help.

文本文件如下所示:

0=2.2.5 BUILD (tons of other junk here)

我想提取2.2.5.没有其他的.有人可以帮我做正则表达式吗?

I am wanting to extract 2.2.5. Nothing else. Can someone help me with the regex for this?

推荐答案

如果您知道结构，则不需要正则表达式:

If you know the structure, you don't need a regex:

    String line = "0=2.2.5 BUILD (tons of other junk here)";
    String versionNumber = line.split(" ", 2)[0].substring(2);

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