Defining a regular expression containing double quotes

[aaditya190]

I have defined a regular expression for double quotes i.e whatever comes in "" gets some format..using qtextcharformat..and one expression for operator +.. like

QRegExp rx1("\".*\"");
QRegExp rx2("\\+");
rx1.setForeground((QColor::red));
rx2.setForeground((QColor::orange));

QRegExp rx1("\".*\"");
QRegExp rx2("\\+");
rx1.setForeground((QColor::red));
rx2.setForeground((QColor::orange));

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The problem i am facing is that if i type + inside double quotes, it doesn't get the format i defined for "" i.e it retains its orange color instead should be red only as written inside "". Can anyone suggest me what wrong I am doing?