run-tests: make "| foo (re)" not match everything
We make "foo (re)" match the entire line by adding a \Z to the regular expression before matching. However, that doesn't help when the regular expression is something like "| foo", because that gets translated to "| foo\Z", where the "|" has lower precedence and it thus matches the empty string, which is of course a prefix of every string. Fix by wrapping expression in a group before adding the \Z to the end. Differential Revision: https://phab.mercurial-scm.org/D1546
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