Create a RegExp for me please?

Question

I need to grab the value of this statement:
var transfer=  5.39;

Which would return 5.39.   The 5.39 will be any number, greater then 100 is acceptable, and im not sure if it will always be 2 decimal places.

This is the only occurance of a transfer= in the searched text, so it shouldn't be too difficult to grab this number, I just am unable to make these statements aha.  So what it should do is:

Value after "transfer=" and before ";" removing all whitespace.

Thanks!

Ngo Cong Huan · Accepted Answer

you can using #include <string> to using basic_string (from Standard C++ Library ) to store your statement.
Assume you have string str="var transter = 5.39;"
Now we will get the numeric value 
void GetValue(std::string str,double &numeric)
{
 //Looking for = assignment position in str
 for (int i=0;i<str.length();i++)
 if (str[i]== ' = ' )
 {
 //Get substring from position character after "=" to the end
  string temp=str.substr(i+1);
 //Remove all space and ' ; '  to get string represent numeric
  int k=0;
  while(k<temp.length())
  {
   if (str[k]=='  ') str.erase(k,1); //Erase space 
   if (str[k]==';') str.earse(k,1); //Erase ;
   k++;
  }

 //Convert string to numeric data
  numeric=atof(temp.c_str());
 return; //Quit
 }
}

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Create a RegExp for me please?

1 Answer