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

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 )

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

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)
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)
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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