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AWS WAF
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UpdateRegexMatchSet

Inserts or deletes RegexMatchTuple objects (filters) in a RegexMatchSet. For each RegexMatchSetUpdate object, you specify the following values:

  • Whether to insert or delete the object from the array. If you want to change a RegexMatchSetUpdate object, you delete the existing object and add a new one.

  • The part of a web request that you want AWS WAF to inspectupdate, such as a query string or the value of the User-Agent header.

  • The identifier of the pattern (a regular expression) that you want AWS WAF to look for. For more information, see RegexPatternSet.

  • Whether to perform any conversions on the request, such as converting it to lowercase, before inspecting it for the specified string.

For example, you can create a RegexPatternSet that matches any requests with User-Agent headers that contain the string B[a@]dB[o0]t. You can then configure AWS WAF to reject those requests.

To create and configure a RegexMatchSet, perform the following steps:

  1. Create a RegexMatchSet. For more information, see CreateRegexMatchSet.

  2. Use GetChangeToken to get the change token that you provide in the ChangeToken parameter of an UpdateRegexMatchSet request.

  3. Submit an UpdateRegexMatchSet request to specify the part of the request that you want AWS WAF to inspect (for example, the header or the URI) and the identifier of the RegexPatternSet that contain the regular expression patters you want AWS WAF to watch for.

For more information about how to use the AWS WAF API to allow or block HTTP requests, see the AWS WAF Developer Guide.

Request Syntax

{
   "ChangeToken": "string",
   "RegexMatchSetId": "string",
   "Updates": [ 
      { 
         "Action": "string",
         "RegexMatchTuple": { 
            "FieldToMatch": { 
               "Data": "string",
               "Type": "string"
            },
            "RegexPatternSetId": "string",
            "TextTransformation": "string"
         }
      }
   ]
}

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

ChangeToken

The value returned by the most recent call to GetChangeToken.

Type: String

Length Constraints: Minimum length of 1.

Required: Yes

RegexMatchSetId

The RegexMatchSetId of the RegexMatchSet that you want to update. RegexMatchSetId is returned by CreateRegexMatchSet and by ListRegexMatchSets.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 128.

Required: Yes

Updates

An array of RegexMatchSetUpdate objects that you want to insert into or delete from a RegexMatchSet. For more information, see RegexMatchTuple.

Type: Array of RegexMatchSetUpdate objects

Array Members: Minimum number of 1 item.

Required: Yes

Response Syntax

{
   "ChangeToken": "string"
}

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

ChangeToken

The ChangeToken that you used to submit the UpdateRegexMatchSet request. You can also use this value to query the status of the request. For more information, see GetChangeTokenStatus.

Type: String

Length Constraints: Minimum length of 1.

Errors

For information about the errors that are common to all actions, see Common Errors.

WAFDisallowedNameException

The name specified is invalid.

HTTP Status Code: 400

WAFInternalErrorException

The operation failed because of a system problem, even though the request was valid. Retry your request.

HTTP Status Code: 500

WAFInvalidAccountException

The operation failed because you tried to create, update, or delete an object by using an invalid account identifier.

HTTP Status Code: 400

WAFInvalidOperationException

The operation failed because there was nothing to do. For example:

  • You tried to remove a Rule from a WebACL, but the Rule isn't in the specified WebACL.

  • You tried to remove an IP address from an IPSet, but the IP address isn't in the specified IPSet.

  • You tried to remove a ByteMatchTuple from a ByteMatchSet, but the ByteMatchTuple isn't in the specified WebACL.

  • You tried to add a Rule to a WebACL, but the Rule already exists in the specified WebACL.

  • You tried to add an IP address to an IPSet, but the IP address already exists in the specified IPSet.

  • You tried to add a ByteMatchTuple to a ByteMatchSet, but the ByteMatchTuple already exists in the specified WebACL.

HTTP Status Code: 400

WAFLimitsExceededException

The operation exceeds a resource limit, for example, the maximum number of WebACL objects that you can create for an AWS account. For more information, see Limits in the AWS WAF Developer Guide.

HTTP Status Code: 400

WAFNonexistentContainerException

The operation failed because you tried to add an object to or delete an object from another object that doesn't exist. For example:

  • You tried to add a Rule to or delete a Rule from a WebACL that doesn't exist.

  • You tried to add a ByteMatchSet to or delete a ByteMatchSet from a Rule that doesn't exist.

  • You tried to add an IP address to or delete an IP address from an IPSet that doesn't exist.

  • You tried to add a ByteMatchTuple to or delete a ByteMatchTuple from a ByteMatchSet that doesn't exist.

HTTP Status Code: 400

WAFNonexistentItemException

The operation failed because the referenced object doesn't exist.

HTTP Status Code: 400

WAFStaleDataException

The operation failed because you tried to create, update, or delete an object by using a change token that has already been used.

HTTP Status Code: 400

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: