function::matched - Return a given matched subexpression.

n
           index to the subexpression to return. 0 corresponds to the entire regular expression.

       returns the content of the n'th subexpression of the last successful use of the =~ regex matching
       operator. Returns an empty string if the n'th subexpression was not matched (e.g. due to alternation).
       Throws an error if the last use of =~ was a failed match, or if fewer than n subexpressions are present
       in the original regexp.

       function::matched - Return a given matched subexpression.

tapset::regex(3stap)

SystemTap Tapset Reference                         April 2024                           FUNCTION::MATCHED(3stap)

           matched:string(n:long)