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Forum Discussion

RoutingLoop_179's avatar
RoutingLoop_179
Icon for Cirrus rankCirrus
Mar 28, 2017

Scan or split to find last instance of character.

Hi is there an efficient way to find the last occurrence of a character in a string and split into 2 variables.   Currently I use "scan [TCP::payload] {%[^@]@%s} garbage sitename"   This splits...
application delivery
iRules
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Mar 29, 2017

Hi RoutingLoop,

you may try a combination of 

[string last]
and 
[string range]
to find the position of the last occurrence and to cut the leading/trailing values.

set input        "test@test@test.de"
set last_at       [string last "@" $input]
set leading_part  [string range $input 0 [expr { $last_at - 1 }]]
set trailing_part [string range $input [expr { $last_at + 1 }] end]

... or you could try a combination of 

[split]
, 
[lrange]
, 
[lindex]
and 
[join]
to create and select the required 
[list]
entries and to format the resulting string. 

set input         "test@test@test.de"
set input_list    [split $input "@" ]
set leading_part  [join [lrange $input_list 0 end-1] "@"]
set trailing_part [lindex $input_list end]

Note: Performance wise both example are almost equal. So it will depend only on your personal preferences.

Cheers, Kai