Regular Expression - HTTP URI

I want to match on http://www.xyz.com/abc/ with anything after "/abc/"

I want to match on http://www.xyz.com/abc/QW with anything after "QW"

you may try scan command.

% set uri1 "/abc/anythig"
/abc/anythig
% scan $uri1 {/abc/%s} var1
1
% put $var1
anythig

iRules 101 - 16 - Parsing Strings with the TCL Scan Command by Jason Rahm

https://devcentral.f5.com/articles/irules-101-16-parsing-strings-with-the-tcl-scan-command

I want to match on any value @ the Query string "cal"

URI::query

https://devcentral.f5.com/wiki/iRules.URI__query.ashx

[root@ve11c:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when RULE_INIT {
  set uri1 "/abc.aspx?cal=anything"
  log local0. "URI is $uri1 and parameter cal value is [URI::query $uri1 cal]"
}
}
[root@ve11c:Active:In Sync] config  tail -f /var/log/ltm
Apr 12 15:55:39 ve11c info tmm1[5649]: Rule /Common/qux : URI is /abc.aspx?cal=anything and parameter cal value is anything

Here is an iRule that I shared with a few customers:

when HTTP_REQUEST {
        if { [HTTP::uri] starts_with "/abc"} {
                  set path [HTTP::uri]

                   variable loc marks the "Second" occurrence of a '/'.  This will drop /abc
                   if you want to drop /abc/xyz, locate the "Third" occurence of '/' by changing 1 to 2 at 

                  set loc [string first "/" $path 1]

                  set path_minus_root [string range $path $loc end]

                  Note:  the value of variable path_minus_root will start with a '/'
                  HTTP::redirect "https://www.company.com/new_site/qux$path_minus_root"
        }
}

You can also do this job using the [URI::path [HTTP::uri]] commands which are very useful.

https://devcentral.f5.com/wiki/iRules.URI.ashx