dumb way to parse&reconstruct URL, rev.0

url_parse() {
  sed -nre '
  /^(([^:]+):(\/{0,2}))?(([^:]+):([^@]+)@)?([^:\/]*)?:?([^/]+)?(.*)$/ {
    h
    s##U[scheme]="\1"#p;g
    s##U[user]="\5"#p;g
    s##U[pass]="\6"#p;g
    s##U[domain]="\7"#p;g
    s##U[port]="\8"#p;g
    s##U[path]="\9"#;s#/./#/#g;s#/+#/#g;p
  }' | tr '"' "'"
}
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