Question

I’m trying to come up with a regular expression that will indicate if the URL provided is the index page of the site. This means it has to match example.com, example.com/ and example.com/index.php but not example.com/page.php

Here’s a list that I came up with for testing. So many permutations due to www/non-www, http/https, trailing slashes, etc.

It should match these:

• http://example.com/index.php
• http://example.com/
• http://example.com
• http://example.com/index.php?var=X
• http://example.com/?var=X
• http://example.com?var=X
• https://example.com/index.php
• https://example.com/
• https://example.com
• https://example.com/index.php?var=X
• https://example.com/?var=X
• https://example.com?var=X
• http://www.example.com/index.php
• http://www.example.com/
• http://www.example.com
• http://www.example.com/index.php?var=X
• http://www.example.com/?var=X
• http://www.example.com?var=X
• https://www.example.com/index.php
• https://www.example.com/
• https://www.example.com
• https://www.example.com/index.php?var=X
• https://www.example.com/?var=X
• https://www.example.com?var=X

It should NOT match these

• http://example.com/page.php
• http://example.com/page.php?var=X
• http://example.com/page
• http://example.com/page/
• http://example.com/page/index.php
• http://example.com/page?var=X
• http://example.com/page/?var=X
• https://example.com/page.php
• https://example.com/page.php?var=X
• https://example.com/page
• https://example.com/page/
• https://example.com/page/index.php
• https://example.com/page?var=X
• https://example.com/page/?var=X
• http://www.example.com/page.php
• http://www.example.com/page.php?var=X
• http://www.example.com/page
• http://www.example.com/page/
• http://www.example.com/page/index.php
• http://www.example.com/page?var=X
• http://www.example.com/page/?var=X
• https://www.example.com/page.php
• https://www.example.com/page.php?var=X
• https://www.example.com/page
• https://www.example.com/page/
• https://www.example.com/page/index.php
• https://www.example.com/page?var=X
• https://www.example.com/page/?var=X

(Are there any other combinations I left out?)

All I’ve come up with so far is:

example.com(/|index.php|)

which is obviously incorrect as it is matching the /page values too.

Answer 1

This works

^https?://[^/]+(/(\?.*|index\.php(\?.*)?)?)?$

Note this is a generic regex. To match your flavor you might need to escape.

After running a simple test with egrep here is the result

$ while read x 
>       do 
>           if  echo $x | egrep '^https?://[^/]+(/(\?.*|index\.php(\?.*)?)?)?$' > /dev/null
>           then  
>               echo MATCH $x
>           else 
>               echo NOT MATCH $x 
>           fi
>       done < data
MATCH http://example.com/index.php
MATCH http://example.com/
MATCH http://example.com
MATCH http://example.com/index.php?var=X
MATCH http://example.com/?var=X
MATCH http://example.com?var=X
MATCH https://example.com/index.php
MATCH https://example.com/
MATCH https://example.com
MATCH https://example.com/index.php?var=X
MATCH https://example.com/?var=X
MATCH https://example.com?var=X
MATCH http://www.example.com/index.php
MATCH http://www.example.com/
MATCH http://www.example.com
MATCH http://www.example.com/index.php?var=X
MATCH http://www.example.com/?var=X
MATCH http://www.example.com?var=X
MATCH https://www.example.com/index.php
MATCH https://www.example.com/
MATCH https://www.example.com
MATCH https://www.example.com/index.php?var=X
MATCH https://www.example.com/?var=X
MATCH https://www.example.com?var=X
NOT MATCH http://example.com/page.php
NOT MATCH http://example.com/page.php?var=X
NOT MATCH http://example.com/page
NOT MATCH http://example.com/page/
NOT MATCH http://example.com/page/index.php
NOT MATCH http://example.com/page?var=X
NOT MATCH http://example.com/page/?var=X
NOT MATCH https://example.com/page.php
NOT MATCH https://example.com/page.php?var=X
NOT MATCH https://example.com/page
NOT MATCH https://example.com/page/
NOT MATCH https://example.com/page/index.php
NOT MATCH https://example.com/page?var=X
NOT MATCH https://example.com/page/?var=X
NOT MATCH http://www.example.com/page.php
NOT MATCH http://www.example.com/page.php?var=X
NOT MATCH http://www.example.com/page
NOT MATCH http://www.example.com/page/
NOT MATCH http://www.example.com/page/index.php
NOT MATCH http://www.example.com/page?var=X
NOT MATCH http://www.example.com/page/?var=X
NOT MATCH https://www.example.com/page.php
NOT MATCH https://www.example.com/page.php?var=X
NOT MATCH https://www.example.com/page
NOT MATCH https://www.example.com/page/
NOT MATCH https://www.example.com/page/index.php
NOT MATCH https://www.example.com/page?var=X
NOT MATCH https://www.example.com/page/?var=X