How to use irules to do like this

Question

How to use irules to do like this :
We have an ip like:123.12.3.5
How to get the string like:123.12.3&nbsp;
Thanks a lot!&nbsp;

vernonwells · Answer

Let us say that you are operating on the client IP:
set reduced [string range $ip 0 [expr { [string last . [IP::client_addr]] - 1 }]]

This is ~20% faster than a variant:
set reduced [join [lrange [split [IP::client_addr] .] 0 2] .]

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