FQL v4 will be decommissioned on June 30, 2025. Ensure that you complete your migration from FQL v4 to FQL v10 by that date.

Fauna accounts created after August 21, 2024 must use FQL v10. These accounts will not be able to run FQL v4 queries or access the v4 Dashboard.

For more details, see the v4 EOL announcement and migration guide. Contact support@fauna.com with any questions.

ReplaceStr

This reference topic applies to FQL v4. Go to this page for the latest FQL v10 reference topics.

 
ReplaceStr( value, find, replace )
replace_str( value, find, replace )
ReplaceStr( value, find, replace )
ReplaceStr( value, find, replace )
ReplaceStr( value, find, replace )
ReplaceStr( value, find, replace )

Description

The ReplaceStr function returns a string which has all occurrences of the find sub-string replaced with the replace string. Punctuation in the find string is interpreted literally and not as a pattern.

Parameters

Parameter Type Definition and Requirements

value

String

The source String to search through.

find

String

The sub-string to be found in the value string.

replace

String

The new string that should replace the find sub-string.

Returns

A new String which has all of the find sub-strings replaced with the replace string.

Examples

The following query executes an array of independent ReplaceStr operations and returns the results in an array. The result array position matches the execution array position. The individual operations are:

  1. The string "One Fish Two Fish" is processed, replacing all instances of "Two" with "Blue". The result string "One Fish Blue Fish" is placed in the top position of the result array.

  2. The string "One Fish Two Fish" is processed, replacing all instances of "Fish" with "CAT". The resultant string "One CAT Two CAT" is placed in the second position of the result array.

  3. The string "One Fis? Two Fish" is processed, replacing all instances of the "Fis?" with "Fish". The resultant String "One Fish Two Fish" is placed in the third position of the result array.

client.query(
  [
    q.ReplaceStr('One Fish Two Fish', 'Two', 'Blue'),
    q.ReplaceStr('One Fish Two Fish', 'Fish', 'CAT'),
    q.ReplaceStr('One Fis? Two Fish', 'Fis?', 'Fish'),
  ]
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))
[ 'One Fish Blue Fish', 'One CAT Two CAT', 'One Fish Two Fish' ]
result = client.query(
  [
    q.replace_str("One Fish Two Fish", "Two", "Blue"),
    q.replace_str("One Fish Two Fish", "Fish", "CAT"),
    q.replace_str("One Fis? Two Fish", "Fis?", "Fish"),
  ]
)
print(result)
['One Fish Blue Fish', 'One CAT Two CAT', 'One Fish Two Fish']
result, err := client.Query(
	f.Arr{
		f.ReplaceStr("One Fish Two Fish", "Two", "Blue"),
		f.ReplaceStr("One Fish Two Fish", "Fish", "CAT"),
		f.ReplaceStr("One Fis? Two Fish", "Fis?", "Fish"),
	})

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
[One Fish Blue Fish One CAT Two CAT One Fish Two Fish]
try
{
    Value result = await client.Query(
        Arr(
            ReplaceStr("One Fish Two Fish", "Two", "Blue"),
            ReplaceStr("One Fish Two Fish", "Fish", "CAT"),
            ReplaceStr("One Fis? Two Fish", "Fis?", "Fish")
        )
    );

    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
Arr(StringV(One Fish Blue Fish), StringV(One CAT Two CAT), StringV(One Fish Two Fish))
System.out.println(
    client.query(
        Arr(
            ReplaceStr("One Fish Two Fish", "Two", "Blue"),
            ReplaceStr("One Fish Two Fish", "Fish", "CAT"),
            ReplaceStr("One Fis? Two Fish", "Fis?", "Fish")
        )
    ).get());
["One Fish Blue Fish", "One CAT Two CAT", "One Fish Two Fish"]
[
  ReplaceStr('One Fish Two Fish', 'Two', 'Blue'),
  ReplaceStr('One Fish Two Fish', 'Fish', 'CAT'),
  ReplaceStr('One Fis? Two Fish', 'Fis?', 'Fish'),
]
[ 'One Fish Blue Fish', 'One CAT Two CAT', 'One Fish Two Fish' ]
Query metrics:

  •    bytesIn: 197

  •   bytesOut:  73

  • computeOps:   1

  •    readOps:   0

  •   writeOps:   0

  •  readBytes:   0

  • writeBytes:   0

  •  queryTime: 2ms

  •    retries:   0

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