How can I do this: User types URL into form, form appends a string to the url, and

Noob here.

How can I do this:

User types URL into a form on my page, a script takes that url and appends a string to the url, the script also changes all “:” %3A into and “/” into %2F and all “?” into %3F (basically change all characters into URL encoded characters), then the script opens a new tab to the newly contructed URL.

So with more details, the user will type a Google Play app URL (ex [url]https://play.google.com/store/apps/details?id=com.proletariat.worldzombination[/url])

The type that into my form, then some how I need to it add this to the start: [url]http://download.freeapk.ru/en.php?[/url]

Then I need it to look like this: [url]http://download.freeapk.ru/en.php?package=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.proletariat.worldzombination[/url]

Is this possible?

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