(GH-6) Add test case.
(GH-6) Remove the quotation symbols.

This will prevent us from matching /^INSERT/ for example if we have leading "/'/qq/q.
(GH-6) Search for SQL keywords at the beginning of the string.

This solves a number of false positives. We don't want to catch a regular string that has nothing to do with SQL, for example "The information will UPDATE in $delay hours".