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Help Center/ EventGrid/ User Guide/ Event Rules/ Filter Rule Parameters

Filter Rule Parameters

Updated on 2023-10-26 GMT+08:00

Only events that match your filter rules will be routed to the associated targets. These filter rules must have the same structure as the events.

This section describes the restrictions of filter rules as well as the operators, condition expressions, and matching fields.

Restrictions

Event filter rules must meet the following requirements:

  • Top-level fields can only be source, type, subject, or data.
  • Top-level fields must include source, and source only supports the StringIn operator.
  • The data field allows max. 5 subfields, and each can have max. 5 levels.
  • Each field can have max. 5 conditions in an OR relationship.
  • Multiple fields are ANDed with each other.
  • A field that appears more than once at the same level will be used where it appears the last time.

Operators

Table 1 lists the operators that can be used in event filter rules.

Table 1 Operators

Operator

Input Value

Condition Value

Description

StringIn

String/String[]

String[] values

Check if the input value matches any condition value.

StringNotIn

String/String[]

String[] values

Check if the input value does not match any condition value.

StringStartsWith

String/String[]

String[] values

Check if the input value prefix matches any condition value.

StringNotStartsWith

String/String[]

String[] values

Check if the input value prefix does not match any condition value.

StringEndsWith

String/String[]

String[] values

Check if the input value suffix matches any condition value.

StringNotEndsWith

String/String[]

String[] values

Check if the input value suffix does not match any condition value.

NumberIn

Number/Number[]

Number[] values

Check if the input value matches any condition value.

NumberNotIn

Number/Number[]

Number[] values

Check if the input value does not match any condition value.

NumberLessThan

Number/Number[]

Number value

Check if the input value is less than the condition value.

NumberNotLessThan

Number/Number[]

Number value

Check if the input value is greater than or equal to the condition value.

NumberGreaterThan

Number/Number[]

Number value

Check if the input value is greater than the condition value.

NumberNotGreaterThan

Number/Number[]

Number value

Check if the input value is less than or equal to the condition value.

NumberInRange

Number/Number[]

Number[][] values

Check if the input value is within any condition value range.

NumberNotInRange

Number/Number[]

Number[][] values

Check if the input value is not within any condition value range.

IsNull

-

None

Check if the input value is null or undefined.

IsNotNull

-

None

Check if the input value is neither null nor undefined.

IsTrue

Boolean

None

Check if the input value is true.

IsNotTrue

Boolean

None

Check if the input value is false.

Condition Expressions

Table 2 lists the condition expressions that can be used in event filter rules.

Table 2 Condition expressions

Field Name

Type

Required

Description

op

String

Yes

Operator

value

JSON Type

No

Condition value

values

JSON Array

No

Condition value range

Matching Fields

Table 3 lists the matching fields that can be used in event filter rules.

Table 3 Matching fields

Field Name

Condition Value Type

Example

source

JSON array

Event source. The condition value is in the JSON array. This field can only be used with the StringIn operator.

Example: [{"op": "StringIn", "values": ["HC.OBS"]]

type

JSON array

Event type. The condition value is in the JSON array.

Example: [{"op": "StringIn", "values": ["object:put"]]

subject

JSON array

Event body. The condition value is in the JSON array.

Example: [{"op": "StringEndsWith", "values": [".jpg"]]

data

JSON object

Event data. The condition value is in the JSON object, and can be nested in max. 5 layers.

Example: {"state": [{"op": "StringIn", "values": ["running"]]}]

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