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Using pgrep:

grep -Po '(^|[ ,])KEY1:\K[^,]*' 

or egrep and cut:

grep -Eo '(^|[ ,])KEY2:[^,]*' | cut -d: -f2- 

For both methods, the Value is not allowed to contain comma.

If you had proper json, e.g.

{ "KEY1":"VALUE1", "KEY2":"VALUE2", "KEY3":"VALUE3" } 

you could use jq:

$ jq .KEY2 "VALUE2" $ jq -r .KEY2 VALUE2 

Using PCRE-enabled grep implementations:

grep -Po '(^|[ ,])KEY1:\K[^,]*' 

or egrep and cut:

grep -Eo '(^|[ ,])KEY2:[^,]*' | cut -d: -f2- 

For both methods, the Value is not allowed to contain comma.

If you had proper json, e.g.

{ "KEY1":"VALUE1", "KEY2":"VALUE2", "KEY3":"VALUE3" } 

you could use jq:

$ jq .KEY2 "VALUE2" $ jq -r .KEY2 VALUE2 

Using pgrep:

grep -Po '(^|[ ,])KEY1:\K[^,]*' 

or egrep and cut:

grep -Eo '(^|[ ,])KEY2:[^,]*' | cut -d: -f2- 

For both methods, the Value is not allowed to contain comma.

If you had proper json, e.g.

{ "KEY1":"VALUE1", "KEY2":"VALUE2", "KEY3":"VALUE3" } 

you could use jq:

jq ".KEY2" 

Using pgrep:

grep -Po '(^|[ ,])KEY1:\K[^,]*' 

or egrep and cut:

grep -Eo '(^|[ ,])KEY2:[^,]*' | cut -d: -f2- 

For both methods, the Value is not allowed to contain comma.

If you had proper json, e.g.

{ "KEY1":"VALUE1", "KEY2":"VALUE2", "KEY3":"VALUE3" } 

you could use jq:

$ jq .KEY2 "VALUE2" $ jq -r .KEY2 VALUE2 

Using pgrep:

grep -Po '(^|[ ,])KEY1:\K[^,]*' 

or normal grep and cut:

grep -o '\bKEY2:[^,]*' | cut -d: -f2- 

For both methods, the Value is not allowed to contain comma.

If you had proper json, e.g.

{ "KEY1":"VALUE1", "KEY2":"VALUE2", "KEY3":"VALUE3" } 

you could use jq:

jq ".KEY2" 

Using pgrep:

grep -Po '(^|[ ,])KEY1:\K[^,]*' 

or egrep and cut:

grep -Eo '(^|[ ,])KEY2:[^,]*' | cut -d: -f2- 

For both methods, the Value is not allowed to contain comma.

If you had proper json, e.g.

{ "KEY1":"VALUE1", "KEY2":"VALUE2", "KEY3":"VALUE3" } 

you could use jq:

jq ".KEY2"