dumb way to parse&reconstruct URL, rev.1

sed_replace() { echo -n "s#$1#$2#g;";}
sed_squeeze() { sed_replace "$1+" "${2:-$1}";}
sed_push() { echo -n 'h;';}
sed_pop() { echo -n 'g;';}
sed_print() { echo -n 'p;';}
sed_script1=$(
  sed_ere_begin() { echo -n "/$1/{"; sed_push;}
  sed_assign() { sed_replace '' "U[$2]='\\$1'";}
  sed_ere_end() { echo '}';}
  sed_ere_begin '^(([^:]+):(\/{0,2}))?(([^:]+):([^@]+)@)?([^:\/]*)?:?([^/]+)?(.*)$'
    sed_assign 1 scheme; sed_print; sed_pop
    sed_assign 5 user; sed_print; sed_pop
    sed_assign 6 pass; sed_print; sed_pop
    sed_assign 7 domain; sed_print; sed_pop
    sed_assign 8 port; sed_print; sed_pop
    sed_assign 9 path; sed_replace '/./' '/'; sed_squeeze '/'; sed_print
    sed_ere_end
  unset -f sed_ere_begin sed_assign sed_ere_end
)
url_parse() {
  sed -nre "${sed_script1}"
}
url_construct() {
  echo ${U[scheme]:-''}${U[user]}${U[pass]:+':'}${U[pass]}${U[user]:+'@'}${U[domain]}${U[port]:+':'}${U[port]}${U[path]:-'/'}
}

declare -A U
u1='https://UsErNaMe:My5tR0nGp4s5@domain.ru:8088//./dump.txt'
u2='file:///home/krd/lulz.txt'

echo "${u1}" | url_parse
# output:
#   U[scheme]='https://'
#   U[user]='UsErNaMe'
#   U[pass]='My5tR0nGp4s5'
#   U[domain]='domain.ru'
#   U[port]='8088'
#   U[path]='/dump.txt'
eval $(echo "${u1}" | url_parse)
url_construct
# output:
#   https://UsErNaMe:My5tR0nGp4s5@domain.ru:8088/dump.txt

echo "${u2}" | url_parse
# output:
#   U[scheme]='file://'
#   U[user]=''
#   U[pass]=''
#   U[domain]=''
#   U[port]=''
#   U[path]='/home/krd/lulz.txt'
eval $(echo "${u2}" | url_parse)
url_construct
# output:
#   file:///home/krd/lulz.txt