* Pawan Kumar <pawan....@gmail.com> [210528 12:43]:
> Hi Team,
>
> I was using slice function to extract last 2 characters in go template but
> not able to do ,as -ve range is not supported by slice function .
>
> For example - My cluster name is turbo-ab-03 , i can extract if i know
> exact length of cluster name.
>
> {{ slice (index .ServiceMeta "cluster_name") 9 11}}
> Results - 03
>
> But it fails , if i use negative range ( Want to extract last 2 characters)
>
> {{ slice (index .ServiceMeta "cluster_name") -1 2}}
>
> kindly help.
>
> thanks
Neither the slice expression in the Go language, nor the slice function
in the text/template and html/template packages allow negative slice
indexes. Also, the template language does not allow arbitrary
arithmetic expressions directly. However, you can define your own
functions for the template and use them. In this playground example,
«https://play.golang.org/p/yvFRYVe2Bu5», I defined a function "sub" that
I use to calculate the correct arguments to the slice function.
You can also use variables to avoid repeating long expressions:
{{$c := index .ServiceMeta "cluster_name"}}
{{slice $c (sub (len $c) 2) (len $c)}}
...Marvin
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