how to process string with boost::sregex_iterator in reverse order

usually we do

Code:

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boost::sregex_iterator itrBeginPath(alltext.begin(), alltext.end(), patternPath);

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but i have match condition and need to get closest previous appearance of some info, i dont know how to do it with greedy matching, but i can do it if reverse string and condition before search. But reversing expensive operation. Can i iterate througth my string from end to begin? How? Thanks.

Use rbegin() and rend()

it said:
cannot convert parameter 1 from 'std::reverse_iterator<_RanIt>' to 'std::_String_const_iterator<_Elem,_Traits,_Alloc>
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