RegexRouter¶
The following provides usage information for the Apache Kafka® SMT org.apache.kafka.connect.transforms.RegexRouter.
Caution
RegexRouter is not currently available for managed connectors.
Description¶
Update the record’s topic using the configured regular expression and replacement string.
Under the hood, the regex is compiled to a java.util.regex.Pattern. If the pattern matches the input topic, java.util.regex.Matcher#replaceFirst() is used with the replacement string to obtain the new topic.
Examples¶
The following examples show how to configure and use RegexRouter.
Remove a topic prefix¶
This configuration snippet shows how to remove the prefix soe- from the
beginning of a topic.
"transforms":"dropPrefix",
"transforms.dropPrefix.type":"org.apache.kafka.connect.transforms.RegexRouter",
"transforms.dropPrefix.regex":"soe-(.*)",
"transforms.dropPrefix.replacement":"$1"
Before: soe-Order
After: Order
Add a topic prefix¶
This configuration snippet shows how to add the prefix acme_ to the
beginning of a topic.
"transforms"="AddPrefix"
"transforms.AddPrefix.type"="org.apache.kafka.connect.transforms.RegexRouter"
"transforms.AddPrefix.regex"=".*"
"transforms.AddPrefix.replacement"="acme_$0"
Before: Order
After: acme_Order
Remove part of a topic name¶
This configuration snippet shows how to remove a string in a topic name.
"transforms=RemoveString"
"transforms.RemoveString.type"="org.apache.kafka.connect.transforms.RegexRouter"
"transforms.RemoveString.regex=(.)Stream_(.)"
"transforms.RemoveString.replacement=$1$2"
Before: Order_Stream_Data
After: Order_Data
Properties¶
| Name | Description | Type | Default | Valid Values | Importance |
|---|---|---|---|---|---|
regex |
Regular expression to use for matching. | string | valid regex | high | |
replacement |
Replacement string. | string | high |
Predicates¶
Transformations can be configured with predicates so that the transformation is applied only to records which satisfy a condition. You can use predicates in a transformation chain and, when combined with the Filter (Apache Kafka), predicates can conditionally filter out specific records. For details and examples, see Predicates.