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Forum Discussion

DifanZ's avatar
DifanZ
Icon for Cirrus rankCirrus
Jul 13, 2021

irule for extracting a string from a URI

Hi experts, I am new to irule and it doesn't look like I am allowed much time to learn it properly... In short, they want me to redirect to a URL when all the members in the pool are down. The probl...
devops
iRules
LTM
spalande's avatar
spalande
Icon for Nacreous rankNacreous
Jul 14, 2021

You can try below.

 when HTTP_REQUEST {
  if { ([string tolower [HTTP::uri]] starts_with "/ecmlivelink/llisapi.dll/open") and ([active_members livelink_qut_tcp_8100_pool] == 0) } {
  set doc_id [string range [HTTP::uri] 30 end]
  HTTP::respond 301 Location "http://csintqut.network.qut:81/fsl/Redirect.aspx?docid=$doc_id"
  return
 }
}
DifanZ's avatar
DifanZ
Icon for Cirrus rankCirrus
Jul 15, 2021

Thanks Sanjay. The length might be dynamic and there could be at least a slash at the end of the link.. I actually opened a case and I am provided with a regular expression code like this

regexp "/open/(\[0-9\]+" $uri something doc_id

This successfully got me the number, regardless of the pending characters. But thanks anyway for your help!