Helm equals to one of multiple values - kubernetes-helm

Question

I want to have a condition that will be considered as "true" if .Values.envName is "dev" + the release namespace name is one of a closed list. otherwise, it should be "false".
Tried the following, but seems like it gets unexpected "false" when I ran it with .Values.envName = dev & .Values.envName = ns-1:
env:
- name: MY_ENV
{{- if and (eq .Values.envName "dev") (regexMatch "^(?!^ns-1$)(?!^ns-2$).*$" .Release.Namespace)}}
value: 'true'
{{- else }}
value: 'false'
{{- end }}
A general note - if there is a better way to use eq with multiple possible values please let me know.

Answer 1

You can use has to test if some item is in a list; and then you can use list to construct a list of known items.
So for your example, if the test is that envName is exactly dev, and the namespace is either ns-1 or ns-2, then you can say
env:
{{- $isDev := eq .Values.envName "dev" }}
{{- $isNs := list "ns-1" "ns-2" | has .Release.Namespace }}
- name: MY_ENV
value: {{ and $isDev $isNs | toString | quote }}
You could do this case with a regular expression too. The start-of-string test ^ and the end-of-string test $ generally need to be outside parentheses; I wouldn't worry about "non-greedy matches" if you're just trying to determine whether a string matches without extracting things. Here I might write either of
{{- $isNs := regexMatch "^ns-[12]$" .Release.Namespace }}
{{- $isNs := regexMatch "^ns-1|ns-2$" .Release.Namespace }}
If you've got an enumerated list of values that don't neatly fall into a regex, using has and list is probably clearer.