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.

`ContainsStr`

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

ContainsStr( value, search )

contains_str( value, search )

ContainsStr( value, search )

ContainsStr( value, search )

ContainsStr( value, search )

ContainsStr( value, search )

Description

The ContainsStr function returns true when the value string contains the search string, or false when it does not.

Parameters

Parameter Type Definition and Requirements

Parameter	Type	Definition and Requirements
`value`	String	The string to compare.
`search`	String	The string to search for within `value`.

value

String

The string to compare.

search

String

The string to search for within value.

Returns

Returns a boolean: true when value contains search, or false when it does not.

Examples

The following query demonstrates the case where the value string contains the search string:

client.query(
  q.ContainsStr('Fauna', 'a')
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))

true

result = client.query(
    q.contains_str("Fauna", "a")
)
print(result)

True

result, err := client.Query(
	f.ContainsStr("Fauna", "a"))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}

true

try
{
    Value result = await client.Query(
        ContainsStr("Fauna", "a")
    );
    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}

BooleanV(True)

System.out.println(
    client.query(
        ContainsStr("Fauna", "a")
    ).get()
);

true

ContainsStr('Fauna', 'a')

true

Query metrics:

bytesIn: 36
bytesOut: 17
computeOps: 1
readOps: 0
writeOps: 0
readBytes: 0
writeBytes: 0
queryTime: 2ms
retries: 0

The following query demonstrates the case where the value string does not contain the search string:

client.query(
  q.ContainsStr('Fauna', 'q')
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))

false

result = client.query(
    q.contains_str("Fauna", "q")
)
print(result)

False

result, err := client.Query(
	f.ContainsStr("Fauna", "q"))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}

false

try
{
    Value result = await client.Query(
        ContainsStr("Fauna", "q")
    );
    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}

BooleanV(False)

System.out.println(
    client.query(
        ContainsStr("Fauna", "q")
    ).get()
);

false

ContainsStr('Fauna', 'q')

false

Query metrics:

bytesIn: 36
bytesOut: 18
computeOps: 1
readOps: 0
writeOps: 0
readBytes: 0
writeBytes: 0
queryTime: 3ms
retries: 0

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