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  1. import re
  2.  
  3. string = ("1John Radcliffe Hospital/Oxford/United Kingdom, 11Ruhr-Universität \n"
  4. "3/Bochum/Bochum/Germany, 3University of British Columbia/Vancouver/Canada, 4National \n"
  5. "Institute of Neuroscience, National Center of Neurology and Psychiatry/Tokyo/Japan, \n"
  6. "5University of Catania/Catania/Italy, 6F. Hoffmann-La Roche Ltd/Basel/Switzerland, 7 \n"
  7. "University of Colorado School of Medicine/Aurora/United States of America")
  8.  
  9. result = re.sub(r'(?:^|, )\d+(?!/)', r'\g<0>=', string, 0, re.MULTILINE).strip()
  10. print(result)
Success #stdin #stdout 0.03s 9684KB
stdin
Standard input is empty
stdout
1=John Radcliffe Hospital/Oxford/United Kingdom, 11=Ruhr-Universität 
3/Bochum/Bochum/Germany, 3=University of British Columbia/Vancouver/Canada, 4=National 
Institute of Neuroscience, National Center of Neurology and Psychiatry/Tokyo/Japan, 
5=University of Catania/Catania/Italy, 6=F. Hoffmann-La Roche Ltd/Basel/Switzerland, 7= 
University of Colorado School of Medicine/Aurora/United States of America