Many thanks Marvin , really appreciate it.
Regards
On Sat, 29 May 2021, 00:21 Marvin Renich, <m...@renich.org> wrote:
> * 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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