Is there any way to get the file extension from a URL

Question

I want to know that for make sure that the file that will be download from my script will have the extension I want.

The file will not be at URLs like:

h         


        

Answer 1

I know that this is an old question, but can be helpful to people that see this question.

The best approach for getting an extension from filename inside an URL, also with parameters are with regex.

You can use this pattern (not urls only):

.+(\.\w{3})\?*.*

Explanation:

.+     Match any character between one and infinite
(...)  With this, you create a group, after you can use for getting string inside the brackets
\.     Match the character '.'
\w     Matches any word character equal to [a-zA-Z0-9_]
\?*    Match the character '?' between zero and infinite
.*     Match any character between zero and infinite

Example:

http://example.com/file.png
http://example.com/file.png?foo=10

But if you have an URL like this:

http://example.com/asd
This take '.com' as extension.

So you can use a strong pattern for urls like this:

.+\/{2}.+\/{1}.+(\.\w+)\?*.*

Explanation:

.+        Match any character between one and infinite
\/{2}     Match two '/' characters
.+        Match any character between one and infinite
\/{1}     Match one '/' character
.+        Match any character between one and infinite
(\.\w+)  Group and match '.' character and any word character equal to [a-zA-Z0-9_] from one to infinite
\?*       Match the character '?' between zero and infinite
.*        Match any character between zero and infinite

Example:

http://example.com/file.png          (Match .png)
https://example.com/file.png?foo=10  (Match .png)
http://example.com/asd               (No match)
C:\Foo\file.png                      (No match, only urls!)

http://example.com/file.png

    http:        .+
    //           \/{2}
    example.com  .+
    /            \/{1}
    file         .+
    .png         (\.\w+)