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@verb #51:"parse_subst" this none this rxdo #60
@program #51:"parse_subst" this none this
recognized_flags = length(args) >= 2 ? args[2] | "gc"
null_subst_msg = length(args) >= 3 ? args[3] | "Null substitution?"
cmd = args[1]
if (!cmd)
  return "/xxx/yyy[/[g][c]] [<range>] expected.."
endif
bchar = cmd[1]
cmd = cmd[2..length(cmd)]
fromstr = cmd[1..(b2 = index(cmd + bchar, bchar, 1)) - 1]
cmd = cmd[b2 + 1..length(cmd)]
tostr = cmd[1..(b2 = index(cmd + bchar, bchar, 1)) - 1]
cmd = cmd[b2 + 1..length(cmd)]
cmdlen = length(cmd)
b2 = 0
while ((b2 = b2 + 1) <= cmdlen && index(recognized_flags, cmd[b2]))
endwhile
return fromstr == "" && tostr == "" ? null_subst_msg | {fromstr, tostr, cmd[1..b2 - 1], cmd[b2..cmdlen]}
.

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