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<a href="https://github.com/wikimedia/parsoid/commit/481bb905f">Assert that template argument whitespace matching succeeds

The regexp is changed to avoid the excessive backtracking in some cases.

If the match runs up against the `pcre.backtrack_limit`, it fails, which
was being ignored.  That resulted in the matches array being empty and
php notices when trying to access it.  Here we prefer an early hard
failure.

Phan has a `UseReturnValuePlugin` that probably should have caught this
but it looks like it special cases `preg_match` and others.

Bug: T237103
Change-Id: I</a><a class="double-link" href="https://github.com/wikimedia/parsoid/commit/2d352cb0e">2d352cb0e</a>

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