Trying to understand basic regex functions in C++ -


i've done regular expressions in perl years , trying utilize them in c++. having problems though. want parse through string such translate(0.0,-572.36218) , grab 2 numerical values.

here's have far:

std::cmatch m; std::regex e("([-|\.|0-9]*),([-|\.|0-9]*)" );    std::regex_search ("translate(0.0,-572.36218)",m,e); float xtransform = atof(m[1].first); float ytransform = atof(m[2].first);

however when @ values in debugger here's see:

m[0].first = "0.0,-572.36218)" m[1].first = "0.0,-572.36218)" m[3].first = "-572.36218)";

if use regex debugging tool (like regex coach) can see regular expression syntactically correct. guess don't know if i'm doing right, or how extract data need cmatch instance.

update: must missing something, because if change regular expression this:

std::regex e("([0-9])");

m returns being 2 entries deep , each entry's first element = "0.0,-572.36218)". why matching parenthesis beyond me. , [0-9] seem have no effect.. matches every character. fristrating. :(

you should have used \\.. when used \., matched whole string - because \. escaped c .. later . multiplied * in [-|.|0-9]* match anything.


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