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Showing content from https://en.cppreference.com/w/cpp/language/../regex/basic_regex/../match_results/position.html below:

difference_type position( size_type n = 0 ) const;

(since C++11)

Returns the position of the first character of the specified sub-match.

If n == 0, the position of the first character of the entire matched expression is returned.

If n > 0 && n < size(), the position of the first character of the n^th sub-match is returned.

if n >= size(), a position of the first character of the unmatched match is returned.

ready() must be true. Otherwise, the behavior is undefined.

[edit] Parameters n - integral number specifying which match to examine [edit] Return value

The position of the first character of the specified match or sub-match.

[edit] Example [edit] See also

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