# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression.
sed -E 's/([tk]) . b/\1 . p/gm;t' <<< "? ' a l t . b aU
m u . z ' i: k . b r a n . C @
r ' Y k . b @ . ts y: . k l I C"
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for SED, please visit: https://www.gnu.org/software/sed/manual/html_node/The-_0022s_0022-Command.html