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lang-bash
\1/pin backquotes won't work at all (I assume you copied/entered that wrong) ands/pattern/\1/pis really a combination of two things: replace the matched data with the first match group, and after completing the substitution print the resulting line. But it won't work here because you didn't specify any match group(s). If you do specify a group like's/.*\([goodchars]\+.*\)/\1/p'then the command will run but it will select only one char per line not all the 'good' ones.