oh-my-fish/plugins/msg/msg.util.str.get.fish

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# Extract string between left and right separators of variable length.
# @params <left-sep> [<right-sep>] <string>
function msg.util.str.get
set -l left $argv[1]
set -l right $argv[1]
set -l string $argv[2]
if [ (count $argv) -gt 2 ]
set right $argv[2]
set string $argv[3]
end
set -l len (printf $left | awk '{print length}')
# Match between outermost left / right separators.
printf $string | sed "s/[^\\$left]*\(\\$left.*\\$right\)*/\1/g" | \
sed "s/^.\{$len\}\(.*\).\{$len\}\$/\1/"
end