sed regex to match exact pattern and ignore some pattern

I have a YML, in which I need to append numeric with double quotes. I tried various regex but somehow it gets break somewhere or other. I need to avoid alphanum or alpha…

- name: HEALTH_ELASTIC_HOST 
  value: 40c07d4283d245.elastic.test.com
- name: HEALTH_ELASTIC_PORT
  value: 9243
- name: HEALTH_ELASTIC_USERNAME
  value: elastic

The basic cmd which I took, and modified

sed 's/[0-9]*[0-9]/"&"/g' values.yaml

Expected Result

- name: HEALTH_ELASTIC_HOST 
  value: 40c07d4283d245.elastic.test.com
- name: HEALTH_ELASTIC_PORT
  value: "9243"
- name: HEALTH_ELASTIC_USERNAME
  value: elastic

Any help is appreciated..link to any doc or cmd.

>Solution :

You may use this sed:

sed -E 's/([: ]+)([0-9]+) *$/\1"\2"/' file.yml

- name: HEALTH_ELASTIC_HOST
  value: 40c07d4283d245.elastic.test.com
- name: HEALTH_ELASTIC_PORT
  value: "9243"
- name: HEALTH_ELASTIC_USERNAME
  value: elastic

Explanation:

• ([: ]+): Match 1+ of : or space and capture in group #2
• ([0-9]+): Match 1+ digits an capture in group #2
• *: Match 0 or more spaces
• $: match end position
• \1"\2": In substitution we wrap back-reference #2 with double quotes