[Bug 761225] pad: Allow multiple conversion specifiers for request pads and don't require it at the very end

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761225

--- Comment #24 from Wonchul Lee <chul0812 at gmail.com> ---
Yes, it's very ambiguous if we regard '_' as a valid string for the request
template, in that case, "src_a_b_c" seems to be impossible to find proper
template. It can be the various template as you mentioned(src_%s, src_%s_%s
...).
If we wrap the specifier with another special character to distinguish between
multiple specifiers that would solve this ambiguous, template should be
"src_(%s)_(%s)", looks little strange though.
We've just used '_' to specify strings conventionally and thought that
"src_a_b_c" is the "src_%s_%s_%s" instinctively. So I suggest not to allow '_'
as a part of request template name.

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