Coyote Point Systems Equalizer GX Series, Administration Manual

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Using Regular Expressions in Responders
In some cases, it may be desirable to examine the URL of an incoming request and re-use parts of
it in the URL returned to the client by a Redirect Responder. This is the purpose of the regex
parameter: specify a custom regular expression that is used to:
l
Parse the URL of an incoming request
l
Break it down into separate strings (based on the positions of literal characters in the
expression)
l
Assign each string to a named variable
These named variables can then be used in the URL field of the Redirect Responder. When the
Responder replies to a client, it performs string substitution on the URL. Because the purpose of
using regular expressions to perform string substitution in Redirect URLs is to parse request URLs
into strings, constructing an appropriate regular expression requires an exact knowledge of the
format of the request URLs that will typically be coming in to the cluster IP.
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Equalizer Administration Guide