使用 sed 或 awk 替换变量中的文本

Question

I have a variable with the value as below,

var1="heritage=external-dns,external-dns/owner=us-east-1:testapp-sandbox,external-dns/resource=ingress/monitoring/prometheus-operator-grafana"

var2=us-east-1:testapp-dev

I want to replace only the text between owner= and ,external-dns which is us-east-1:testapp-sandbox with the content from var2.

So I am expecting output as below,

var1_updated="heritage=external-dns,external-dns/owner=us-east-1:testapp-dev,external-dns/resource=ingress/monitoring/prometheus-operator-grafana"

I tried this, sed -i 's/(owner=).*(,external-dns)/\1us-east-1:testapp-dev\2/g' value.txt but its throwing me error as invalid command code v

Please let me know how to do this using sed or awk...

Answer 1

Your command is close to valid, just use extented regex with -E switch:

sed -E 's/(owner=).*(,external-dns)/\1us-east-1:testapp-dev\2/g' <<< "$var1"

Now using variable:

sed -E "s/(owner=).*(,external-dns)/\1$var2\2/g" <<< "$var1"

Note that double quotes are mandatory here for shell to expand variables