正则表达式以匹配特定文件名

Question

I am trying to parse some HTML of a directory listing page using c#. That page has many file urls like "0220109_120548.046.jpg" but has also others like "0220109_120548.046-445x265.jpg". They are the same picture but one has its dimensions in the name.

I need a regex to match only the urls of those files without the dimensions.

I tried this one: href="^"*.(gif|jpg|png)"

but its not working.

the regex101 url: https://regex101.com/r/APS9NY/1

Answer 1

Here is one way to do so:

href=\"[^\"]*?(?<!\d{2,4}x\d{2,4})\.(gif|jpg|png)\"

See here for the online demo.

---

• href=\" : Matches href="
• [^\"]*? : Any character that isn't " , between zero and unlimited times, as few as possible.
• (?<!) : Negative lookbehind.
  • \d{2,4} : Matches between 2 and 4 digits.
  • x : Matches x .
• \. : Matches . .
• (gif|jpg|png) : Matches either gif , jpg or png .
• \" : Matches " .