How to use the field in search query EXTRACTED using REX command

[rangineniarunku]

I have a field named "content" with multiple values to it as follows
content=value.deva
content=value.devb
" =value.devc ......
I have written a rex expression in my search query .........| rex field=Name ".(?.*)" to extract the Environment from the field content . Now I want to get the values in my result only for Environment=deva, how can I use the field Environment in my query?
I tried this way but it did not work ".........| rex field=content ".(?.)" | Environment=deva "

Can someone help me with this?

[DalJeanis · Accepted solution]

You are looking for the | where command.

| where Environment="myvalue" 

[rangineniarunku]

It worked!!!