Mao Jiayi created FLINK-40240:
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Summary: Support additional Flink SQL regular expression functions
in YAML Transform
Key: FLINK-40240
URL: https://issues.apache.org/jira/browse/FLINK-40240
Project: Flink
Issue Type: Improvement
Components: Flink CDC
Reporter: Mao Jiayi
Flink CDC YAML Transform currently supports REGEXP_REPLACE, but the other
regular expression functions commonly available in Flink SQL are missing.
This limits the ability to extract, locate, and count pattern matches in
row-level transform expressions. Users currently need to implement UDFs for
these operations.
The missing functions include:
* REGEXP_EXTRACT
* REGEXP_EXTRACT_ALL
* REGEXP_COUNT
* REGEXP_INSTR
* REGEXP_SUBSTR
YAML Transform should support these functions with behavior aligned with Flink
SQL, including Java regular expression syntax, capture group indexes, NULL
arguments, invalid patterns, and unmatched input.
REGEXP_EXTRACT_ALL should return ARRAY<STRING> and work correctly in YAML
Transform projections.
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