Trailing space with UltiSnips snippet

Hi,

I use the UltiSnips¹ plugin and have a snippet as follows:

snippet sst
\start${1} ${2}
${3}
\stop${1/\s*//g}
$0
endsnippet

This works fine if I provide an argument for the start command:

sst<trigger>foo<trigger>bar<trigger> leads to

\startfoo bar

\stopfoo

But this snippet should also work without an argument, but it leaves
a trailing space:

sst<trigger>foo<trigger><trigger> leads to

\startfoo

\stopfoo

How do I define this snippet so it doesn't leave the trailing space
when no argument is provided?

Marco

¹ https://github.com/SirVer/ultisnips

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