4 ms·
Not as exciting as PCRE checking for primality, but: python -c 'import re;print(re.match(r"^(.*)\1$",abs(int(input("n=")))*"1")and"Even"or"Odd")'
by btdmaster 3y ago
Not as exciting as PCRE checking for primality, but:
python -c 'import re;print(re.match(r"^(.*)\1$",abs(int(input("n=")))*"1")and"Even"or"Odd")'