Replace number in a URL...

[Badchip]

I'm using "extract_unit" function in order to extract a URL. Now I want to change the first number (15) to 9.

http://name15.test.com/live/test/index.m3u8?token=ab8hH3_1Y-d33BdyW_oxcQ&expires=1515075458

(The URL name/number can vary (for example "http://nemo2.test.com..."))

I used the function: $unit = preg_replace('~(?:\A..|(?!\A)\G)[^0-9]*\K[0-9]+~', '9', $unit);
but it changes all the numbers.

Please can you help me with the regular expressions in order to change only the first number?

Thank you in advance.

Edited January 3, 2018 by Badchip

[Ingolme]

If "test.com" is always the same then you can search for that.

preg_replace('[0-9]+\\.test\\.com', '9.test.com', $unit);

 

[Badchip]

It doesn't work for me. I get a blank page. It's correct \\.test\\.com ?

I tried with: 

$unit = preg_replace('~[0-9]+~', '9', $unit);

... but it changes the whole URL... (all the numbers to 9)

Any idea?

Edited January 3, 2018 by Badchip

[Ingolme]

Yes, two slashes are necessary, since one of them is to escape the backslash in the PHP string. If the page is blank that means the PHP syntax is incorrect, check your server's error log to find out why. It looks like I forgot delimiters around my regular expression, which you should have been able to identify on your own.

preg_replace('#[0-9]+\\.test\\.com#', '9.test.com', $unit);

Your expression selects any set of digits, that's why it's changing the whole URL. If you want to identify a particular set of digits then you need to find parts of the URL that are surrounding it.

[Badchip]

The two hash (#) have solved the problem. Thank you!
I have minimized the code:

$unit = preg_replace('#[0-9]+\.#', '9.', $unit);

 

Edited January 4, 2018 by Badchip