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emulate -L zsh
setopt extendedglob
autoload read-from-minibuffer
local p1="Replace: " p2=" with: "
local src rep REPLY MATCH MBEGIN MEND curwidget=$WIDGET
local -a match mbegin mend
read-from-minibuffer $p1 || return 1
src=$REPLY
read-from-minibuffer "$p1$src$p2" || return 1
rep=$REPLY
if [[ $curwidget = *pattern* ]]; then
local rep2
# The following horror is so that an & preceded by an even
# number of backslashes is active, without stripping backslashes,
# while preceded by an odd number of backslashes is inactive,
# with one backslash being stripped. A similar logic applies
# to \digit.
while [[ $rep = (#b)([^\\]#)(\\\\)#(\\|)(\&|\\<->|\\\{<->\})(*) ]]; do
if [[ -n $match[3] ]]; then
# Expression is quoted, strip quotes
rep2="${match[1]}${match[2]}${match[4]}"
else
rep2+="${match[1]}${match[2]}"
if [[ $match[4] = \& ]]; then
rep2+='${MATCH}'
elif [[ $match[4] = \\\{* ]]; then
rep2+='${match['${match[4][3,-2]}']}'
else
rep2+='${match['${match[4][2,-1]}']}'
fi
fi
rep=${match[5]}
done
rep2+=$rep
LBUFFER=${LBUFFER//(#bm)$~src/${(e)rep2}}
RBUFFER=${RBUFFER//(#bm)$~src/${(e)rep2}}
else
LBUFFER=${LBUFFER//$src/$rep}
RBUFFER=${RBUFFER//$src/$rep}
fi
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