Common Text Transformation Library: follow

// sample code: follow_whitespace.cpp
// demonstrates custom white space policy
// defined as dash characters, '-'.
#include <iostream>
#include "cttl/cttl.h"

using namespace cttl;

struct policy_dash : public policy_default
{
    template< typename UniverseT >
    static size_t match( UniverseT& universe_ )
    {
        typedef typename UniverseT::char_T char_T;
        size_t non_greedy_offset = universe_.first.offset();
        ( true ^ *symbol( char_T( '-' ) ) ).match( universe_ );
        // policy_dash is non-greedy:
        return non_greedy_offset;
    }
};  // struct policy_dash

int main()
{
    input<> inp( "-a-b-c--d-e-f---" );
    const_edge< policy_dash > universe( new_edge( inp ) );
    const_edge<> data( new_edge( inp ) );
    size_t result = ( data( +entity( isalpha ) ) ).match( universe );
    assert( result != std::string::npos );
    std::cout << "data: /" << data.text() << '/' << std::endl;
    return 0;
}

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