iRule Redirect isnt working

It isn't working because you are trying to compare the HTTP::host string to a full location (host + URI). Change your iRule to look like this:

when HTTP_REQUEST { 
 if {[string tolower [HTTP::host]] equals "wcp.xx.com" and [string tolower [HTTP::uri]] starts_with "/wxx" } { 
  HTTP::redirect "https://pushdev.xx.com/[HTTP::uri]" 
  } 
}

is it possible i can do the URL masking with this ? So users can always see wcp.xx.com\wxx on the address bar

if you do not want to change display url in browser, you can use HTTP::header and/or HTTP::uri to change HTTP header (e.g. host header) and URI when sending request to pool member.

is it possible i can do the URL masking with this ? So users can always see wcp.xx.com\wxx on the address bar

if you do not want to change display url in browser, you can use HTTP::header and/or HTTP::uri to change HTTP header (e.g. host header) and URI when sending request to pool member.

e.g.

 config

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 2
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm pool foo
ltm pool foo {
    members {
        200.200.200.101:80 {
            address 200.200.200.101
        }
    }
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  if { [string tolower [HTTP::host]] eq "wcp.xx.com" and [string tolower [HTTP::path]] starts_with "/wxx" } {
    HTTP::header replace Host "pushdev.xx.com"
    HTTP::uri [string map {/wxx/ /} [HTTP::uri]]
  }
}
}

 trace

[root@ve11a:Active:In Sync] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.24.4(58847) <-> 172.28.24.10(80)
1397589044.7888 (0.0015)  C>S
---------------------------------------------------------------
GET /wxx/something HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: wcp.xx.com

---------------------------------------------------------------

New TCP connection 2: 200.200.200.14(58847) <-> 200.200.200.101(80)
1397589044.7908 (0.0019)  C>S
---------------------------------------------------------------
GET /something HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: pushdev.xx.com

---------------------------------------------------------------

e.g.

 config

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 2
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm pool foo
ltm pool foo {
    members {
        200.200.200.101:80 {
            address 200.200.200.101
        }
    }
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  if { [string tolower [HTTP::host]] eq "wcp.xx.com" and [string tolower [HTTP::path]] starts_with "/wxx" } {
    HTTP::header replace Host "pushdev.xx.com"
    HTTP::uri [string map {/wxx/ /} [HTTP::uri]]
  }
}
}

 trace

[root@ve11a:Active:In Sync] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.24.4(58847) <-> 172.28.24.10(80)
1397589044.7888 (0.0015)  C>S
---------------------------------------------------------------
GET /wxx/something HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: wcp.xx.com

---------------------------------------------------------------

New TCP connection 2: 200.200.200.14(58847) <-> 200.200.200.101(80)
1397589044.7908 (0.0019)  C>S
---------------------------------------------------------------
GET /something HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: pushdev.xx.com

---------------------------------------------------------------

thats didnt worked:(

have you captured packet to see what the wrong is?

sol10209: Overview of packet tracing with the ssldump utility