Used to save the matched value within the group for use later in the regular
expression or to extract the values captured. Both named and unnamed groups
can later be referenced using capture_group.
Arguments
- ...
shortcuts, R variables, text, or other rex functions.- name
of the group. Unnamed capture groups are numbers starting at 1 in the order they appear in the regular expression. If two groups have the same name, the leftmost group is the used in any reference.
See also
group for grouping without capturing. Perl 5 Capture
Groups https://perldoc.perl.org/perlre#Capture-groups
Other rex:
%or%(),
character_class(),
counts,
group(),
lookarounds,
not(),
rex(),
shortcuts,
wildcards
Examples
# Match paired quotation marks
re <- rex(
# first quotation mark
capture(quotes),
# match all non-matching quotation marks
zero_or_more(except(capture_group(1))),
# end quotation mark (matches first)
capture_group(1)
)
#named capture - don't match apples to oranges
re <- rex(
capture(name = "fruit", or("apple", "orange")),
"=",
capture_group("fruit")
)