c++ - Find a number inside a QString -

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i have qstring number inside it, example

first_34.33string second-23.4string // in case number negative

how can extract number string?

edit:

this function seems work, using regexp in replies:

float getnumberfromqstring(const qstring &xstring) {   qregexp xregexp("(-?\\d+(?:[\\.,]\\d+(?:e\\d+)?)?)");   xregexp.indexin(xstring);   qstringlist xlist = xregexp.capturedtexts();   if (true == xlist.empty())   {     return 0.0;   }     return xlist.begin()->tofloat(); }

this should work valid numbers: qregexp("(-?\\d+(?:[\\.,]\\d+(?:e\\d+)?)?)")

edit: sorry, messed brackets, should work.


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