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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | SEE ALSO | COLOPHON |
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FUNCT...GROUPS(3stap) A collection of standard strinFUNCT...GROUPS(3stap)
function::ngroups - Number of subexpressions in the last match.
ngroups:long()
None
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.
tapset::regex(3stap)
This page is part of the systemtap (a tracing and live-system
analysis tool) project. Information about the project can be
found at ⟨https://sourceware.org/systemtap/⟩. If you have a bug
report for this manual page, send it to systemtap@sourceware.org.
This page was obtained from the project's upstream Git repository
⟨git://sourceware.org/git/systemtap.git⟩ on 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-07-24.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
SystemTap Tapset Reference April 2025 FUNCT...GROUPS(3stap)
Pages that refer to this page: tapset::regex(3stap)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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