Password generator

#!/bin/bash

function d_program() {
    {
      printf '%s\n' "16 non complex"
      printf '%s\n' "24 non complex"
      printf '%s\n' "32 non complex"
      printf '%s\n' "64 non complex"
      printf '%s\n' "96 non complex"
      printf '%s\n' "16 complex"
      printf '%s\n' "24 complex"
      printf '%s\n' "32 complex"
      printf '%s\n' "64 complex"
      printf '%s\n' "96 complex"
    } | dmenu -l 20 -c -b -fn 'SauceCodePro Nerd Font-16' -sb "#cd1bcb" -h 30 -bw 3 -i -p '' ${dmenu_args[@]}
}

choice=$(d_program)

if [[ $choice =~ ^$ ]]; then
    exit 0
fi

chars="a-zA-Z0-9"

length=$(echo $choice | sed 's/\([0-9][0-9]\)\(.\+\)/\1/')
type=$(echo $choice | sed 's/\([0-9][0-9]\)\(.\+\)/\2/')

if [[ type =~ ^complex$ ]]; then
    chars=" a-zA-Z0-9!#$%&()*+-:?@^_{|}~"
fi

pass=$(tr -dc $chars < /dev/urandom | head -c $length)
copied=$(echo -n "$pass" | tr -d '\n' | wl-copy)

notify-send "Generated password [$length] : "$pass --expire-time=2500

exit 0