Rewrite URL based on selected node for load-balancing

I don't know why below code caught all the host name between https:// and the next / except the first letter!i understand square brackets treat thing inside as character rather than word. for example, [https] means h, t, p and s characters. so, if hostname starts with one of them, it will be included.

 

 

tcl scan

 

[chars]

 

The input substring consists of one or more characters in chars. The matching string is stored in the variable. If the first character between the brackets is a ] then it is treated as part of chars rather than the closing bracket for the set. If chars contains a sequence of the form a-b then any character between a and b (inclusive) will match. If the first or last character between the brackets is a -, then it is treated as part of chars rather than indicating a range.

 

 

% set uri_old "http://some.domain.com/something"
http://some.domain.com/something

% scan $uri_old {%*[http://|https://]%[^/]} host_old
1

% put $host_old
ome.domain.com