I'm looking to replace all instances of spaces in urls with %20. How would I do that with regex?
No need for a regex here, if you just want to replace a piece of string by another: using
str_replace() should be more than enough :
$new = str_replace(' ', '%20', $your_string);
But, if you want a bit more than that, and you probably do, if you are working with URLs, you should take a look at the