PHP preg_replace - 替换特殊字符之间的字符

Question

I'm a beginner in PHP. And would need help in resolving the following issue.

This is the the original string

/hs/?page_id=27&file=filename.jpg

And i would like it to be replaced with the following.

/hs/wp-content/gallery/filename.jpg

And please note that the filename and id number are subjected to change everytime. So i guess use of wildcards could be a better choice to replace the characters between "?" and "=" .

How could this be accomplished with the use of reg_replace ? Or is there any other solution ?

Answer 1

The easiest way to replace characters between ? and = is to use the .* regular expression part, which will match "anything, repeated any number of times"

$result = preg_replace('[/hs/\?.*=]', '/hs/wp-content/gallery/', $input);

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A more general solution, if you want to extract the file= component of any input URL, even if the parameters are in a different order, would be:

$result = preg_replace('[.*file=([^&]*).*]', '/hs/wp-content/gallery/\1', $input);