Answers for "regexp to find all ."

regex findall

import re
# regex for finding mentions in a tweet
regex = r"(?<!RTs)@S+"
tweet = '@tony I am so over @got and @sarah is dead to me.'

# mentions = ['@tony', '@got', '@sarah'] 
mentions = re.findall(regex, tweet)

regex all

^(?=[^a-z]*[a-z])(?=[^A-Z]*[A-Z])(?=[^0-9]*[0-9])(?=[^!~<>,;:_=?*+#."&§%°()|[]$^@/-]*[!~<>,;:_=?*+#."&§%°()|[]$^@/-])(?![a-zA-Z0-9!~<>,;:_=?*+#."&§%°()|[]$^@/-]*([a-zA-Z0-9!~<>,;:_=?*+#."&§%°()|[]$^@/-])11)[a-zA-Z0-9!~<>,;:_=?*+#."&§%°()|[]$^@/-]{8,}$