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azizshamim/gist:5666234

Created May 28, 2013 21:18
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awesome regex
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gistfile1.txt
fix_hosts() { sed -i -r "/^[^ \t]+[ \t]+(([^ \t]+[ \t]+)+$1([ \t]+[^ \t]+)*|([^ \t]+[ \t]+)*$2([ \t]+[^ \t]+)+)$/ s/^(.*)($1)(.*)$/\1\3/; /^[^ \t]+[ \t]+$ 1[ \t]*$/d" "$2"; }
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