This method is not used anywhere else:
https://codesearch.wmcloud.org/search/?q=getRawParams
I tried to make the code a bit more readable. Notable:
* Make use of the return value we get from the preg_… function.
* {{3,} means "the character '{' 3 or more times". {{{+ does the
same. Note the { doesn't need to be escaped when it's not
followed by a number.
* At the end, it doesn't make any difference when we scan for
optional closing brackets. The moment we find at least 3 we are
done.
The test is intentionally not moved. This is something for a later
patch.
Bug: T301337
Change-Id: I55e31ceecea2ae7c35bcfbc2d641b35f751820db
