30 Regular expressions library [re]

30.10 Regular expression algorithms [re.alg]

30.10.3 regex_­search [re.alg.search]

Table 144: Effects of regex_­search algorithm [tab:re.alg.search]
Element
Value
m.size()
1 + e.mark_­count()
m.empty()
false
m.prefix().first
first
m.prefix().second
m[0].first
m.prefix().matched
m.prefix().first != m.prefix().second
m.suffix().first
m[0].second
m.suffix().second
last
m.suffix().matched
m.suffix().first != m.suffix().second
m[0].first
The start of the sequence of characters that matched the regular expression
m[0].second
The end of the sequence of characters that matched the regular expression
m[0].matched
true
m[n].first
For all integers 0 < n < m.size(), the start of the sequence that matched sub-expression n.
Alternatively, if sub-expression n did not participate in the match, then last.
m[n].second
For all integers 0 < n < m.size(), the end of the sequence that matched sub-expression n.
Alternatively, if sub-expression n did not participate in the match, then last.
m[n].matched
For all integers 0 < n < m.size(), true if sub-expression n participated in the match, false otherwise.