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Grep value of a specific key from a String, concatenated of key : value pairs

Reversing the value key pairs of array using sed or pattern replacement or brace expansion?Reading a string till a key word and replacing from there with another stringMatching “keyword value” pairs from semi-structured inputComplete key value pairssed/awk replace a specific pattern under another patternHow to grep two strings in line by specific order AND calculating values line by line according to my grepHow to grep lines which have more than specific number of special charactersHow to select specific columns from a file with a string separator

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty
margin-bottom:0;

2

I have a string which is concatenation of "key":"value" pairs separated by "," like-

KEY1:VALUE1, KEY2:VALUE2, KEY3:VALUE3

From this string, I have to grep for a specific string -- let's say KEY2 -- so the output of our command should be VALUE2.

shell-script awk sed

share|improve this question

edited May 19 at 10:43

Jeff Schaller♦

50.3k1111 gold badges7474 silver badges167167 bronze badges

asked May 13 at 12:49

Abhijeet srivastavaAbhijeet srivastava

1111 bronze badge

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Can the values contain quotes commas or colons? Is it JSON?
  
  – Jeff Schaller♦
  May 13 at 12:54
  

  
  
  
  

add a comment
 | 

2

I have a string which is concatenation of "key":"value" pairs separated by "," like-

KEY1:VALUE1, KEY2:VALUE2, KEY3:VALUE3

From this string, I have to grep for a specific string -- let's say KEY2 -- so the output of our command should be VALUE2.

shell-script awk sed

share|improve this question

edited May 19 at 10:43

Jeff Schaller♦

50.3k1111 gold badges7474 silver badges167167 bronze badges

asked May 13 at 12:49

Abhijeet srivastavaAbhijeet srivastava

1111 bronze badge

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Can the values contain quotes commas or colons? Is it JSON?
  
  – Jeff Schaller♦
  May 13 at 12:54
  

  
  
  
  

add a comment
 | 

I have a string which is concatenation of "key":"value" pairs separated by "," like-

KEY1:VALUE1, KEY2:VALUE2, KEY3:VALUE3

From this string, I have to grep for a specific string -- let's say KEY2 -- so the output of our command should be VALUE2.

shell-script awk sed

share|improve this question

edited May 19 at 10:43

Jeff Schaller♦

50.3k1111 gold badges7474 silver badges167167 bronze badges

asked May 13 at 12:49

Abhijeet srivastavaAbhijeet srivastava

1111 bronze badge

KEY1:VALUE1, KEY2:VALUE2, KEY3:VALUE3

share|improve this question

edited May 19 at 10:43

Jeff Schaller♦

50.3k1111 gold badges7474 silver badges167167 bronze badges

asked May 13 at 12:49

Abhijeet srivastavaAbhijeet srivastava

1111 bronze badge

share|improve this question

edited May 19 at 10:43

Jeff Schaller♦

50.3k1111 gold badges7474 silver badges167167 bronze badges

asked May 13 at 12:49

Abhijeet srivastavaAbhijeet srivastava

1111 bronze badge

edited May 19 at 10:43

Jeff Schaller♦

50.3k1111 gold badges7474 silver badges167167 bronze badges

edited May 19 at 10:43

Jeff Schaller♦

50.3k1111 gold badges7474 silver badges167167 bronze badges

asked May 13 at 12:49

Abhijeet srivastavaAbhijeet srivastava

1111 bronze badge

asked May 13 at 12:49

Abhijeet srivastavaAbhijeet srivastava

1111 bronze badge

4 Answers
4

active

oldest

votes

8

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"

share|improve this answer

edited May 14 at 9:02

answered May 13 at 12:56

pLumopLumo

7,9311515 silver badges3636 bronze badges

add a comment
 | 

0

With regular grep assuming VALUE doesn't contain a colon:

grep -o 'KEY2:[^,]+' | grep -o '[^:]+$'

share|improve this answer

edited May 13 at 14:24

answered May 13 at 14:18

ThorThor

13.1k11 gold badge4141 silver badges6464 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @RoVo: added caveat
  
  – Thor
  May 13 at 14:25
  

  
  
  
  

add a comment
 | 

0

To grep only the value

echo $myString | grep -Po "(?<=KEY2:)[^,]*"

or

grep -Po "(?<=KEY2:)[^,]*" <<< $myString

share|improve this answer

answered May 13 at 14:52

bu5hmanbu5hman

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add a comment
 | 

0

Use awk, read key:value pair as record, read key, value as 1st and 2nd field.

awk -v RS=' *, *' -v FS=' *: *' '$1=="KEY2"print $2' <<<$str

• 
  -v RS=' *, *' set record separator to , and it's surrounding space


• 
  -v FS=' *: *' set field separator to : and it's surrounding space


• 
  '$1=="KEY2"print $2' print value if key found. change "KEY2" to your desired key value.

share|improve this answer

answered May 19 at 11:21

dedowsdidedowsdi

87022 silver badges99 bronze badges

add a comment
 | 

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8

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"

share|improve this answer

edited May 14 at 9:02

answered May 13 at 12:56

pLumopLumo

7,9311515 silver badges3636 bronze badges

add a comment
 | 

8

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"

share|improve this answer

edited May 14 at 9:02

answered May 13 at 12:56

pLumopLumo

7,9311515 silver badges3636 bronze badges

add a comment
 | 

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"

share|improve this answer

edited May 14 at 9:02

answered May 13 at 12:56

pLumopLumo

7,9311515 silver badges3636 bronze badges

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

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

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

jq ".KEY2"

share|improve this answer

edited May 14 at 9:02

answered May 13 at 12:56

pLumopLumo

7,9311515 silver badges3636 bronze badges

answered May 13 at 12:56

pLumopLumo

7,9311515 silver badges3636 bronze badges

answered May 13 at 12:56

pLumopLumo

7,9311515 silver badges3636 bronze badges

0

With regular grep assuming VALUE doesn't contain a colon:

grep -o 'KEY2:[^,]+' | grep -o '[^:]+$'

share|improve this answer

edited May 13 at 14:24

answered May 13 at 14:18

ThorThor

13.1k11 gold badge4141 silver badges6464 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @RoVo: added caveat
  
  – Thor
  May 13 at 14:25
  

  
  
  
  

add a comment
 | 

0

With regular grep assuming VALUE doesn't contain a colon:

grep -o 'KEY2:[^,]+' | grep -o '[^:]+$'

share|improve this answer

edited May 13 at 14:24

answered May 13 at 14:18

ThorThor

13.1k11 gold badge4141 silver badges6464 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @RoVo: added caveat
  
  – Thor
  May 13 at 14:25
  

  
  
  
  

add a comment
 | 

With regular grep assuming VALUE doesn't contain a colon:

grep -o 'KEY2:[^,]+' | grep -o '[^:]+$'

share|improve this answer

edited May 13 at 14:24

answered May 13 at 14:18

ThorThor

13.1k11 gold badge4141 silver badges6464 bronze badges

grep -o 'KEY2:[^,]+' | grep -o '[^:]+$'

share|improve this answer

edited May 13 at 14:24

answered May 13 at 14:18

ThorThor

13.1k11 gold badge4141 silver badges6464 bronze badges

answered May 13 at 14:18

ThorThor

13.1k11 gold badge4141 silver badges6464 bronze badges

answered May 13 at 14:18

ThorThor

13.1k11 gold badge4141 silver badges6464 bronze badges

0

To grep only the value

echo $myString | grep -Po "(?<=KEY2:)[^,]*"

or

grep -Po "(?<=KEY2:)[^,]*" <<< $myString

share|improve this answer

answered May 13 at 14:52

bu5hmanbu5hman

1,73311 gold badge44 silver badges1515 bronze badges

add a comment
 | 

0

To grep only the value

echo $myString | grep -Po "(?<=KEY2:)[^,]*"

or

grep -Po "(?<=KEY2:)[^,]*" <<< $myString

share|improve this answer

answered May 13 at 14:52

bu5hmanbu5hman

1,73311 gold badge44 silver badges1515 bronze badges

add a comment
 | 

To grep only the value

echo $myString | grep -Po "(?<=KEY2:)[^,]*"

or

grep -Po "(?<=KEY2:)[^,]*" <<< $myString

share|improve this answer

answered May 13 at 14:52

bu5hmanbu5hman

1,73311 gold badge44 silver badges1515 bronze badges

echo $myString | grep -Po "(?<=KEY2:)[^,]*"

grep -Po "(?<=KEY2:)[^,]*" <<< $myString

share|improve this answer

answered May 13 at 14:52

bu5hmanbu5hman

1,73311 gold badge44 silver badges1515 bronze badges

answered May 13 at 14:52

bu5hmanbu5hman

1,73311 gold badge44 silver badges1515 bronze badges

answered May 13 at 14:52

bu5hmanbu5hman

1,73311 gold badge44 silver badges1515 bronze badges

0

Use awk, read key:value pair as record, read key, value as 1st and 2nd field.

awk -v RS=' *, *' -v FS=' *: *' '$1=="KEY2"print $2' <<<$str

• 
  -v RS=' *, *' set record separator to , and it's surrounding space


• 
  -v FS=' *: *' set field separator to : and it's surrounding space


• 
  '$1=="KEY2"print $2' print value if key found. change "KEY2" to your desired key value.

share|improve this answer

answered May 19 at 11:21

dedowsdidedowsdi

87022 silver badges99 bronze badges

add a comment
 | 

0

Use awk, read key:value pair as record, read key, value as 1st and 2nd field.

awk -v RS=' *, *' -v FS=' *: *' '$1=="KEY2"print $2' <<<$str

• 
  -v RS=' *, *' set record separator to , and it's surrounding space


• 
  -v FS=' *: *' set field separator to : and it's surrounding space


• 
  '$1=="KEY2"print $2' print value if key found. change "KEY2" to your desired key value.

share|improve this answer

answered May 19 at 11:21

dedowsdidedowsdi

87022 silver badges99 bronze badges

add a comment
 | 

Use awk, read key:value pair as record, read key, value as 1st and 2nd field.

awk -v RS=' *, *' -v FS=' *: *' '$1=="KEY2"print $2' <<<$str

• 
  -v RS=' *, *' set record separator to , and it's surrounding space


• 
  -v FS=' *: *' set field separator to : and it's surrounding space


• 
  '$1=="KEY2"print $2' print value if key found. change "KEY2" to your desired key value.

share|improve this answer

answered May 19 at 11:21

dedowsdidedowsdi

87022 silver badges99 bronze badges

awk -v RS=' *, *' -v FS=' *: *' '$1=="KEY2"print $2' <<<$str

share|improve this answer

answered May 19 at 11:21

dedowsdidedowsdi

87022 silver badges99 bronze badges

answered May 19 at 11:21

dedowsdidedowsdi

87022 silver badges99 bronze badges

answered May 19 at 11:21

dedowsdidedowsdi

87022 silver badges99 bronze badges