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|FUNCTION::NGROUPS(3stap)||A collection of standard strin||FUNCTION::NGROUPS(3stap)|
function::ngroups - Number of subexpressions in the last match.
returns the number of subexpressions from the last successful use of the =~ regex matching operator.
Note that this number includes subexpressions which are present in the regex but did not match any string; for example, given the regex “a|(b)”, the subexpressions will count the group for (b) regardless of whether it matched a string or not. Throws an error if the last use of =~ was a failed match.
|November 2020||SystemTap Tapset Reference|