Split alphanumeric strings by space and keep separator for just first occurence

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I am trying to split and then join the first alphanumeric occurrence by space and keep other occurrences as it is, but not getting the pattern to do that. For ex: string: Johnson12 is at club39 converted_string: Jhonson 12 is at club39

Desired Output:

input = "Brijesh Tiwari810663 A14082014RGUBWA"

output = Brijesh Tiwari 810663 A14082014RGUBWA

Code:

import re
regex = re.compile("[0-9]{1,}")
testString = "Brijesh Tiwari810663 A14082014RGUBWA" # fill this in
a = re.split('([^a-zA-Z0-9])', testString)
print(a)
>> ['Brijesh', ' ', 'Tiwari810663', ' ', 'A14082014RGUBWA']
python-re python regex
1 Answers

Here is one way. We can use re.findall on the pattern [A-Za-z]+|[0-9]+, which will alternatively find all letter or all number words. Then, join that resulting list by space to get your output

inp = "Brijesh Tiwari810663 A14082014RGUBWA"
output = ' '.join(re.findall(r'[A-Za-z]+|[0-9]+', inp))
print(output)  # Brijesh Tiwari 810663 A 14082014 RGUBWA

Edit: For your updated requirement, use re.sub with just one replacement:

inp = "Johnson12 is at club39"
output = re.sub(r'\b([A-Za-z]+)([0-9]+)\b', r'\1 \2', inp, 1)
print(output)  # Johnson 12 is at club39
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