#define GID_PREFIX  "dr_"

    QString str = "dr__awedr4";

    int iIdx = str.indexOf(GID_PREFIX);

    qDebug() << iIdx;

    str = "awedr4";

    iIdx = str.indexOf(GID_PREFIX);

    qDebug() << iIdx;

    str = "awedr_4";

    iIdx = str.indexOf(GID_PREFIX);

    qDebug() << iIdx;

-

#define GID_PREFIX  "dr_"

    QString str = "dr__awedr4";

    QString str1;

    int iLen_prefix = strlen(GID_PREFIX);

    int iLen_Left = str.length() - iLen_prefix;

    qDebug() << iLen_Left;

    str1 = str.mid(iLen_prefix, iLen_Left);

    qDebug() << str1;

    str1 = str.mid(iLen_prefix);

    qDebug() << str1;

"_awedr4"

"_awedr4"