SAP Advanced Event Mesh Topic Patterns
Wildcard Usage in Topic Subscriptions
Wildcard *
:
At a certain level: When
*
appears within a topic subscription (e.g.,sap/s4/*/purchaseorders
), it matches any value only at that level.At the end of a topic:
*
at the end (e.g.,sap/s4/sales/*
) matches topics within that level but not deeper levels (e.g.,sap/s4/sales/orders/processed
is not matched).Prefix matching: When followed by a prefix (e.g.,
sap/finance/abc*/budget
), it matches topics with a prefix and any number of characters in between (e.g.,sap/finance/abc/budget
andsap/finance/abcdef/budget
).Multiple
*
usage:*
can appear at different levels in the topic pattern(e.g.,sap/s4/*/purchaseorders/*
), matching topics at those specific levels (e.g.,sap/s4/domestic/purchaseorders/PO123
andsap/s4/international/purchaseorders/PO456
).Literal
*
: If*
is used in any other location within a level (e.g.,sap/*finance
andsap/fi*ce
), it is treated as a literal*
and not as a wildcard.
Wildcard >
:
At the last level: When
>
appears at the last level (e.g.,sap/s4/sales/>
), it matches one or more levels following the prefix (e.g.,sap/s4/sales/orders
andsap/s4/sales/invoices/US
).Not at the last level: When
>
appears any other place (e.g.,sap/s4>
orsap/>/sales
), it is treated as a literal character.
Combined use of *
and >
:
The *
and >
wildcards can be used together (e.g., sap/*/purchaseorders/>
), allowing for flexible topic matching.
Exceptions:
Topic pattern will never match special topics starting with
#P2P
Standalone wildcard
*
on a first level (e.g.,*/sap
) will not match special topics starting with$
More about SAP Advanced Event Mesh Topic Patterns can be found at https://help.pubsub.em.services.cloud.sap/Messaging/Wildcard-Charaters-Topic-Subs.htm
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