FUNCTION::NGROUPS(3stap)A collection of standard strinFUNCTION::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 ALSO
       tapset::regex(3stap)



SystemTap Tapset Reference         June 2018          FUNCTION::NGROUPS(3stap)