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Regular Expression
r"
(?:^|, )\d+(?=\s*[A-Z])
"
gm
Input 1
1
New
1John Radcliffe Hospital/Oxford/United Kingdom, 11Ruhr-Universität 3/Bochum/Bochum/Germany, 3University of British Columbia/Vancouver/Canada, 4National Institute of Neuroscience, National Center of Neurology and Psychiatry/Tokyo/Japan, 5University of Catania/Catania/Italy, 6F. Hoffmann-La Roche Ltd/Basel/Switzerland, 7 University of Colorado School of Medicine/Aurora/United States of America
Substitution
\g<0>=
1John Radcliffe Hospital/Oxford/United Kingdom, 11Ruhr-Universität 3/Bochum/Bochum/Germany, 3University of British Columbia/Vancouver/Canada, 4National Institute of Neuroscience, National Center of Neurology and Psychiatry/Tokyo/Japan, 5University of Catania/Catania/Italy, 6F. Hoffmann-La Roche Ltd/Basel/Switzerland, 7 University of Colorado School of Medicine/Aurora/United States of America