Function regex_search

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## Function regex_search

boost::xpressive::regex_search — Determines whether there is some sub-sequence within `[begin,end)` that matches the regular expression `re`.

## Synopsis

    template<typename BidiIter>
      bool regex_search(BidiIter begin, BidiIter end,
                        match_results< BidiIter > & what,
                        basic_regex< BidiIter > const & re,
                        regex_constants::match_flag_type flags = regex_constants::match_default);
    template<typename BidiIter>
      bool regex_search(BidiIter begin, BidiIter end,
                        basic_regex< BidiIter > const & re,
                        regex_constants::match_flag_type flags = regex_constants::match_default);
    template<typename Char>
      bool regex_search(Char * begin, match_results< Char * > & what,
                        basic_regex< Char * > const & re,
                        regex_constants::match_flag_type flags = regex_constants::match_default);
    template<typename BidiRange, typename BidiIter>
      bool regex_search(BidiRange & rng, match_results< BidiIter > & what,
                        basic_regex< BidiIter > const & re,
                        regex_constants::match_flag_type flags = regex_constants::match_default,
                        unspecified = 0);
    template<typename BidiRange, typename BidiIter>
      bool regex_search(BidiRange const & rng, match_results< BidiIter > & what,
                        basic_regex< BidiIter > const & re,
                        regex_constants::match_flag_type flags = regex_constants::match_default,
                        unspecified = 0);
    template<typename Char>
      bool regex_search(Char * begin, basic_regex< Char * > const & re,
                        regex_constants::match_flag_type flags = regex_constants::match_default);
    template<typename BidiRange, typename BidiIter>
      bool regex_search(BidiRange & rng, basic_regex< BidiIter > const & re,
                        regex_constants::match_flag_type flags = regex_constants::match_default,
                        unspecified = 0);
    template<typename BidiRange, typename BidiIter>
      bool regex_search(BidiRange const & rng, basic_regex< BidiIter > const & re,
                        regex_constants::match_flag_type flags = regex_constants::match_default,
                        unspecified = 0);

## Description

Determines whether there is some sub-sequence within `[begin,end)` that matches the regular expression `re`.

Parameters:

`begin` | The beginning of the sequence
`end` | The end of the sequence
`flags` | Optional match flags, used to control how the expression is matched against the sequence. (See `match_flag_type`.)
`re` | The regular expression object to use
`what` | The `match_results` struct into which the sub_matches will be written

Requires: | Type `BidiIter` meets the requirements of a Bidirectional Iterator (24.1.4). `[begin,end)` denotes a valid iterator range.
Returns: | `true` if a match is found, `false` otherwise
Throws: | \c