python regex find single character

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1# credit to Stack Overflow user in the source link
2# finds isolated alphabetical characters
3import re
4s = "fish oil B stack peanut c <b>"
5
6words = re.finditer('\S+', s)
7has_alpha = re.compile(r'[a-zA-Z]').search
8for word in words:
9    if len(word.group()) == 1 and has_alpha(word.group()):
10        print(word.start()) # prints the index inside the string

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