If you have V8 (I can't recall whether you do ro don't) and there is nothing following the string you need to get rid of (is it always QUAR?) then you might consider trapping on the +, painting the field for the max number of characters that might appear in the numeric part of the string area you need to get and making that the intial field.
In the table create a calculated field that uses the STRIP function to remove the relevant, or all, alpha characters form the string. Maybe a flavour of TRIM if required for onwards processing.
Alternatively and similar if the extra characters are always "QUAR", extract the field to be quite wide, abd then use the STUFF function to replace QUAR with nothing.
OR ... take the field and RTRIM it, use LEN to find the length and then, if the string to be removed is always QUAR, LEFT(field,LEN(trimmed_FIELD)-4). There are a number of ways of writing that particular formula, this is just an outline of the approach rather than a cut and paste!
Strip or Stuff would be my preference if they are available to you.