[string] Escape a string for a sed replace pattern

Based on Pianosaurus's regular expressions, I made a bash function that escapes both keyword and replacement.

function sedeasy {
  sed -i "s/$(echo $1 | sed -e 's/\([[\/.*]\|\]\)/\\&/g')/$(echo $2 | sed -e 's/[\/&]/\\&/g')/g" $3
}

Here's how you use it:

sedeasy "include /etc/nginx/conf.d/*" "include /apps/*/conf/nginx.conf" /etc/nginx/nginx.conf

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