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FUNCTION::NGROUPS(3stap) A collection of standard strin FUNCTION::NGROUPS(3stap)

NAME

function::ngroups - Number of subexpressions in the last match.

SYNOPSIS

    ngroups:long()

ARGUMENTS

None

DESCRIPTION

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.

SEE ALSO0

tapset::regex(3stap)
October 2018 SystemTap Tapset Reference