Forum Discussion

  • if you are looking for case insensitive in stream expression, it is not supported yet.

     

     

    there is request for enhancement which will be implemented.

     

     

    ID355904 - Unable to specify ignore case (?i) to STREAM search expressions

     

  • I think these are the matches Russell is trying to match/replace:

     

     

    http://csweb -> https://csweb

     

    http://www.quantum.com(?!http://www.quantum.com/ProductAwareTandC.aspx) -> https://www.quantum.com

     

    http://maps.google.com -> https://maps.google.com

     

     

    The second one is possibly causing the issue. I think you want this regex instead:

     

     

    @http://www\.quantum\.com(?!/ProductAwareTandC\.aspx)@https://www.quantum.com@

     

     

    If you want to do this without case sensitivity on the capitalized letters, you can use a character set:

     

     

    @http://www\.quantum\.com(?!/[pP]roduct[aA]ware[tT]and[cC]\.aspx)@https://www.quantum.com@

     

     

    If that regex doesn't work and you can't do this with negative lookaheads, you might try a more generic stream expression like @http://www\.quantum\.com[a-zA-Z0-9/?_-]*@@ and then check the matched string using STREAM::match in STREAM_MATCHED to determine whether to rewrite the protocol.

     

     

    There's an example of this on the STREAM::expression wiki page:

     

     

     

    http://devcentral.f5.com/wiki/iRules.STREAM__expression.ashx

     

     

    This example shows how you can use in the event to check if the matched string meets some condition that can't easily be checked for using a single regex in .

     

     

     

    Note that you should escape the periods in the "find" portion of the stream expression so they match on a literal period instead of any single character.

     

     

    Aaron
  • [root@ve1023:Active] config  b virtual bar list
    virtual bar {
       snat automap
       pool foo
       destination 172.28.19.79:80
       ip protocol 6
       rules myrule
       profiles {
          http {}
          stream {}
          tcp {}
       }
    }
    [root@ve1023:Active] config  b pool foo list
    pool foo {
       members {
          200.200.200.101:80 {}
          200.200.200.102:80 {}
       }
    }
    [root@ve1023:Active] config  b rule myrule list
    rule myrule {
       when HTTP_REQUEST {
            STREAM::disable
    }
    
    when HTTP_RESPONSE {
            if {[HTTP::header value Content-Type] contains "text"}{
                    STREAM::expression {@http://csweb@https://csweb@ @@http://www\.quantum\.com(?!/ProductAwareTandC\.aspx)@https://www.quantum.com@ @http://maps\.google\.com@https://maps.google.com@}
                    STREAM::enable
            }
    }
    }
    
    [root@ve1023:Active] config  curl http://200.200.200.101/test.html
    
    
    
    this is host 101.
    
    http://www.yahoo.com/test
    http://csweb/test
    http://www.quantum.com(?!http://www.quantum.com/ProductAwareTandC.aspx)/test
    http://maps.google.com/test
    http://www.f5.com/test
    
    
    
    [root@ve1023:Active] config  curl http://172.28.19.79/test.html
    
    
    
    this is host 101.
    
    http://www.yahoo.com/test
    http://csweb/test
    http://www.quantum.com(?!http://www.quantum.com/ProductAwareTandC.aspx)/test
    http://maps.google.com/test
    http://www.f5.com/test
    
    
    [root@ve1023:Active] config  
    Dec 28 02:02:30 local/tmm err tmm[26866]: 01220005:3: Can't compile regular expression - (http://csweb)|()|(couldn't compile regular expression pattern: invalid escape \ sequence)|()couldn't compile regular expression pattern: invalid escape \ sequence) (Server side: vip=bar profile=stream pool=foo)
    Dec 28 02:02:30 local/tmm err tmm[26866]: 01220001:3: TCL error: myrule  - couldn't compile regular expression pattern: parentheses () not balancedIllegal argument (line 2)     invoked from within "STREAM::expression {@http://csweb@https://csweb@ @@http://www\.quantum\.com(?!/ProductAwareTandC\.aspx)@https://www.quantum.com@ @http://maps\.google\..."