Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
1.4k views
in Technique[技术] by (71.8m points)

regex - Convert relative URL to absolute URL

Input:

  • Base URL: www.example.com/1/2/index.php
  • Relative URL: ../../index.php

Output:

  • Absolute URL: www.example.com/index.php

It would be perfect, of it would be done using sed.

As I understand, this regex should delete one somefolder/ in for every ../ in the URL.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

realpath is a quick but slightly hacky way to do what you want.
(Actually, I'm surprised that it doesn't deal properly with URLs; it treats them as plain old filesystem paths.)
~$ realpath -m http://www.example.com/1/2/../../index.php => ~$ /home/username/http:/www.example.com/index.php
The -m (for "missing") says to resolve the path even if components of it don't actually exist on the filesystem.
So you'll still have to strip off the actual filesystem part of that (which will just be $(pwd). And note that the slash-slash for the protocol was also canonicalized to a single slash. So you might be better off to leave the "http://" off of your input and just prepend it to your output instead.
See man 1 realpath for the full story. Or info coreutils 'realpath invocation' for a more verbose full story, if you have the info system installed.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...