sqldf
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WIP enable extra extensions, not just math
Check for extension parameter on RSQLite::initExtension, and if present, load all default extensions.
The handling of extensions in RSQLite changed in version 2.2.11. This PR should allow the usage of regular expressions.
See also https://github.com/r-dbi/RSQLite/pull/408
Also let me know if the newlines are an issue.