RFC: Function matchall with overlaps #8680
                
     Merged
            
            
          
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This closes #8677.
Problem was that the offset was moving one index at a time instead of moving to the start + 1 of the last match. Therefore matching r"GCG" in "GCGCG" matched when offset was 0, 1 and 2 instead of matching with offset 0 and 2.