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.

ContainsStrRegex

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

 
ContainsStrRegex( value, pattern )
contains_str_regex( value, pattern )
ContainsStrRegex( value, pattern )
ContainsStrRegex( value, pattern )
ContainsStrRegex( value, pattern )
ContainsStrRegex( value, pattern )

Description

The ContainsStrRegex function returns true when the value string matches the pattern regular expression, or false when it does not.

Parameters

Parameter Type Definition and Requirements

value

String

The string to compare.

pattern

String

The regular expression to match within value.

Returns

Returns a Boolean: true when value matches the pattern regular expression, or false when it does not.

Examples

The following query demonstrates the case where the value string matches the pattern regular expression:

client.query(
  q.ContainsStrRegex('Fauna', '(Fa|na)')
)
.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_regex("Fauna", "(Fa|na)")
)
print(result)
True
result, err := client.Query(
	f.ContainsStrRegex("Fauna", "(Fa|na)"))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
true
try
{
    Value result = await client.Query(
        ContainsStrRegex("Fauna", "(Fa|na)")
    );
    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
BooleanV(True)
System.out.println(
    client.query(
        ContainsStrRegex("Fauna", "(Fa|na)")
    ).get()
);
true
ContainsStrRegex('Fauna', '(Fa|na)')
true
Query metrics:

  •    bytesIn:  48

  •   bytesOut:  17

  • computeOps:   1

  •    readOps:   0

  •   writeOps:   0

  •  readBytes:   0

  • writeBytes:   0

  •  queryTime: 3ms

  •    retries:   0

The following query demonstrates the case where the value string does not match the pattern regular expression:

client.query(
  q.ContainsStrRegex('Fauna', '.Faa*')
)
.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_regex("Fauna", ".Faa*")
)
print(result)
False
result, err := client.Query(
	f.ContainsStrRegex("Fauna", ".Faa*"))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
false
try
{
    Value result = await client.Query(
        ContainsStrRegex("Fauna", ".Faa*")
    );
    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
BooleanV(False)
System.out.println(
    client.query(
        ContainsStrRegex("Fauna", ".Faa*")
    ).get()
);
false
ContainsStrRegex('Fauna', '.Faa*')
false
Query metrics:

  •    bytesIn:  46

  •   bytesOut:  18

  • computeOps:   1

  •    readOps:   0

  •   writeOps:   0

  •  readBytes:   0

  • writeBytes:   0

  •  queryTime: 3ms

  •    retries:   0

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