精确匹配8位数字的Java RegEx [英] Java RegEx that matches exactly 8 digits

问题描述

我有一个简单的RegEx，它应该查找8位数字:

I have a simple RegEx that was supposed to look for 8 digits number:

String number = scanner.findInLine("\\d{8}");

但是事实证明，它还匹配9个或更多的数字.如何修复此RegEx以精确匹配8位数字?

But it turns out, it also matches 9 and more digits number. How to fix this RegEx to match exactly 8 digits?

例如:12345678应该匹配，而1234567和123456789不应该.

For example: 12345678 should be matched, while 1234567, and 123456789 should not.

推荐答案

尝试一下:

\ b 被称为单词边界，它将对您的正则表达式说数字在8以后结束

\b is known as word boundary it will say to your regex that numbers end after 8

String number = scanner.findInLine("\\b\\d{8}\\b");

这篇关于精确匹配8位数字的Java RegEx的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！