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Python regex find single character

# credit to Stack Overflow user in the source link
# finds isolated alphabetical characters
import re
s = "fish oil B stack peanut c <b>"

words = re.finditer('\S+', s)
has_alpha = re.compile(r'[a-zA-Z]').search
for word in words:
    if len(word.group()) == 1 and has_alpha(word.group()):
        print(word.start()) # prints the index inside the string

Source: stackoverflow.com

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