in reply to numerically named varsin thread search, replace and backrefrences
Contains the subpattern from the corresponding set
of parentheses in the last pattern matched, not
counting patterns matched in nested blocks that have
been exited already. (Mnemonic: like \digits.)
These variables are all read-only.
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A scientific project
A system/database administration tool
A toy/personal tool
Other web based tool
None of the above
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