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template skip  boost::xpressive::skip — Specify which characters
to skip when matching a regex.   // In header:
<boost/xpressive/regex_primitives.hpp>  template<typename Skip>
unspecified skip(Skip const & skip);   skip() instructs the
regex engine to skip certain characters when matching a regex.
It is most useful for writing regexes that ignore whitespace.
For instance, the following specifies a regex that skips
whitespace and punctuation:   // A sentence is one or more words
separated by whitespace  // and punctuation.  sregex word =
+alpha;  sregex sentence = skip(set[_s | punct])( +word );  The
way it works in the above example is to insert keep(*set[_s |
punct]) before each primitive within the regex. A "primitive"
includes terminals like strings, character sets and nested
regexes. A final *set[_s | punct] is added to the end of the
regex. The regex sentence specified above is equivalent to the
following:   sregex sentence = +( keep(*set[_s