sed regex to match exact pattern and ignore some pattern-CodePudding

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.

CodePudding user response：

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

CodePudding user response：

With your shown samples please try following(experts advise to use yq like tools to edit yaml since OP is using sed here so going with it).

sed -E 's/(^[[:space:]] value: )([0-9] $)/\1"\2"/g' Input_file

Explanation: Simple explanation would be, Using sed's -E option to enable ERE(extended regular expressions) then in main program using regex (^[[:space:]] value: )([0-9] $) along with substitute option of sed. Regex((^[[:space:]] value: )([0-9] $)) will create 2 capturing groups, where 1st one will have values like: value: in it and 2nd capturing group will have digits in it.

Then while performing substitution simply substituting it with 1st capturing group followed by " and 2nd capturing group followed by " as per requirement.

CodePudding user response：

Using sed

$ sed 's/\<[0-9]\ \>/"&"/' input_file
- name: HEALTH_ELASTIC_HOST 
  value: 40c07d4283d245.elastic.test.com
- name: HEALTH_ELASTIC_PORT
  value: "9243"
- name: HEALTH_ELASTIC_USERNAME
  value: elastic