Fix case where the from clause is misidentified.

[darinmanica]

Fix case where the from clause is misidentified.
fixes #2260

Added a zero-width word boundary to the regex that identifies the from clause. This is used in alias detection for order by clauses.

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[gregturn]

Thanks @darinmanica!

Your solution was much simpler than mine.

Future tip: If you could submit PRs against main instead of 2.6.x, it makes the process to review and then backport to supported branches much easier.

[darinmanica]

Thank you @gregturn! I'll be sure to submit PRs against main going forward.