正则表达式匹配广告而不是下载

Question

我用这一行来阻止广告主机名，例如 ad.somedomain.tld 但它似乎阻止了下载、上传等主机名。

([\w.-]+\.)?ad\.[^/]+/?

正确的语法是什么，谢谢

Answer 1

DEMO regex101

正则表达式

\b(?:.?)ad(?:.?)\b

描述

\b Word boundary: match in between (^\w|\w$|\W\w|\w\W)
(?:.?) Non-capturing Group 
    . 0 to 1 times [greedy] Any character (except newline)
ad Literal ad
(?:.?) Non-capturing Group 
    . 0 to 1 times [greedy] Any character (except newline)
\b Word boundary: match in between (^\w|\w$|\W\w|\w\W)

可视化(由 debuggex 提供)