Extract Key Value pairs which matches the regex in YAML with boolean values - yaml

Question

I have this below YAML input and I am trying to extract shown output using yq. I want to remove pairs where key name (VAR-A) in value {{a.b.VAR-A}} (after a.b.) matches and If I have more than one {{a.b.VAR-A}} in values separated by - , I want to keep them.
VAR-A: '{{a.b.VAR-A}}'
VAR-B: '{{a.b.VAR-B}}'
VAR-C: v0.0
VAR-D: '{{a.b.VAR-D}}-{{a.b.VAR-A}}'
VAR-E: '{{a.b.VAR-C}}-{{a.b.VAR-B}}-{{a.b.VAR-A}}'
VAR-F: True
Expected Output:
VAR-C: v0.0
VAR-D: '{{a.b.VAR-D}}-{{a.b.VAR-A}}'
VAR-E: '{{a.b.VAR-C}}-{{a.b.VAR-B}}-{{a.b.VAR-A}}'
VAR-F: True
This question works if I have all strings, but it fails when I have boolean value in yaml. Extract Key Value pairs which matches the regex in YAML using yq/sed/grep
I get below error:
Error: cannot substitute with !!bool, can only substitute strings. Hint: Most often you'll want to use '|=' over '=' for this operation.

Answer 1

There are at least two very different extant "yq" projects: a Python-based one, which is the focus of Part 1 below, and a Go-based one, which is the focus of Part 2.
Part 1
python-yq 'del(.[] | select( ( type == "string" and test("^{{a[.]b[.][^}]*}}$" ))))' so-vars.yaml
or
python-yq 'map_values( select( ( type == "string" and test("^{{a[.]b[.][^}]*}}$" )) | not))' so-vars.yaml
Output:
{
"VAR-C": "v0.0",
"VAR-D": "{{a.b.VAR-D}}-{{a.b.VAR-A}}",
"VAR-E": "{{a.b.VAR-C}}-{{a.b.VAR-B}}-{{a.b.VAR-A}}",
"VAR-F": true
}
Part 2
The Go-based version of yq that I have (4.6.3) might not be able to handle your requirements directly, but here's a solution that uses this yq to translate to and from JSON, and jq to do the rest:
yq -j eval . input.yaml |
jq 'del(.[] | select(( type == "string" and test("^{{a[.]b[.][^}]*}}$" ))))' > tmp.json
yq -P eval . tmp.json
The del-free version of the jq program:
map_values( select( type == "string" and test("^{{a[.]b[.][^}]*}}$" | not)
Output:
VAR-C: v0.0
VAR-D: '{{a.b.VAR-D}}-{{a.b.VAR-A}}'
VAR-E: '{{a.b.VAR-C}}-{{a.b.VAR-B}}-{{a.b.VAR-A}}'
VAR-F: true