Helm regex match from the beginning until the last occurance of a character

Question

Struggling with Helm to match the word from its beginning to the last occurance of -.

I tried {{- printf "%s" .Release.Name | regexFind "[^-]*$" -}}, but it prints from the last occurrance to the end of the word.

Expected

input : hello-world-here => output: hello-world

input : hello-world-here-and-there => output : hello-world-here-and

Maybe `regexReplaceAll "-[^-]*$" - ""` instead of `regexFind`? — Wiktor Stribiżew, Jul 27 '19 at 17:45
Why would you want `-here` to be eliminated in the first, but nothing eliminated in the second? I'm sorry, I can't what rule you want applied. — Andreas, Jul 27 '19 at 17:45
no it does not work. it return nothing (empty string). There is a `-` at the middle. correct ? — Abdennour TOUMI, Jul 27 '19 at 18:22
Maybe you need to use `regexReplaceAll "-[^-]*$" ""`? The regex must work. — Wiktor Stribiżew, Jul 27 '19 at 18:22
same .. empty string ☹️ `{{- printf "%s" .Release.Name | regexReplaceAll "-[^-]*$" "" -}}` .. release name is `ui-lool-local` BTW — Abdennour TOUMI, Jul 27 '19 at 18:28
Do you really need to add `-` at the end? I doubt it is required. Try `{{- printf "%s" .Release.Name | regexReplaceAll "-[^-]*$" "" }}` — Wiktor Stribiżew, Jul 27 '19 at 18:31
does not work. this is my helm version : Client: &version.Version{SemVer:"v2.14.1", GitCommit:"5270352a09c7e8b6e8c9593002a73535276507c0", GitTreeState:"clean"} — Abdennour TOUMI, Jul 27 '19 at 18:48
Ok, what about `{{- regexFind ".*-" .Release.Name | trimSuffix "-" -}}` — Wiktor Stribiżew, Jul 27 '19 at 19:04

score 4 · Accepted Answer · answered Jul 27 '19 at 19:04

4

Big thanks to @Wiktor Stribiżew for his hints.

After a lot of investigation, I realized that the Regex is correct, but the signature of function is amazing :

{{- regexReplaceAll "-[^-]*$" .Release.Name "" -}}

and NOT :

 {{- regexReplaceAll "-[^-]*$"  "" .Release.Name -}}

answered Jul 27 '19 at 19:04

Abdennour TOUMI

That is why I put `-` in between the regex and replacement patterns, I took it for an input variable in the piped notation. – Wiktor Stribiżew Jul 27 '19 at 19:08
5

To make it a bit more clear, the order of the arguments is: pattern, input string, replacement pattern. – ssc327 Oct 29 '20 at 02:46

1 Answers1