31
Regular expressions library
[re]
31.10
Class template
match_results
[re.results]
31.10.3
match_results
size
[re.results.size]
🔗
size_type size() const;
1
#
Returns:
One plus the number of marked sub-expressions in the regular expression that was matched if
*this
represents the result of a successful match
.
Otherwise returns
0
.
[
 
Note
:
The state of a
match_results
object can be modified only by passing that object to
regex_match
or
regex_search
.
Sections
[re.alg.match]
and
[re.alg.search]
specify the effects of those algorithms on their
match_results
arguments
.
—
 
end note
 
]
🔗
size_type max_size() const;
2
#
Returns:
The maximum number of
sub_match
elements that can be stored in
*this
.
🔗
bool empty() const;
3
#
Returns:
size() == 0
.