Don't access out-of-bounds arguments.
Don't access out-of-bounds arguments.

TEST=select REGEXP('abc') from sqlite_master
BUG=30510

Review URL: http://codereview.chromium.org/501038

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@34754 0039d316-1c4b-4281-b951-d872f2087c98

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