regex match several words
# To match the entire line which contains one of foo, man, choo:
^.*(foo|man|choo).*$regex match several words
# To match the entire line which contains one of foo, man, choo:
^.*(foo|man|choo).*$regex one or more words
[ws]+regex match two characters
echo %H#E%L#L%O! | sed 's/[#%]//g' #replaces every appearance of any of
two characters # and %Copyright © 2021 Codeinu
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