TisonKun commented on a change in pull request #6450: [FLINK-9991] Add 
regex_replace supported in TableAPI and SQL
URL: https://github.com/apache/flink/pull/6450#discussion_r205989801
 
 

 ##########
 File path: 
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala
 ##########
 @@ -450,6 +450,39 @@ class ScalarFunctionsTest extends ScalarTypesTestBase {
       "1111111111111111111111111111111111111111111111111111111111111111")
   }
 
+  @Test
+  def testRegexReplace(): Unit = {
+    testAllApis(
+      "foobar".regexReplace("oo|ar", ""),
+      "'foobar'.regexReplace('oo|ar', '')",
+      "regex_replace('foobar', 'oo|ar', '')",
+      "fb")
+
+    testAllApis(
+      "foobar".regexReplace("oo|ar", "abc"),
+      "'foobar'.regexReplace('oo|ar', 'abc')",
+      "regex_replace('foobar', 'oo|ar', 'abc')",
+      "fabcbabc")
+
+    testAllApis(
+      'f33.regexReplace("oo|ar", ""),
+      "f33.regexReplace('oo|ar', '')",
+      "REGEX_REPLACE(f33, 'oo|ar', '')",
+      "null")
+
+    testAllApis(
+      "foobar".regexReplace('f33, ""),
+      "'foobar'.regexReplace(f33, '')",
+      "REGEX_REPLACE('foobar', f33, '')",
+      "null")
+
+    testAllApis(
+      "foobar".regexReplace("oo|ar", 'f33),
+      "'foobar'.regexReplace('oo|ar', f33)",
+      "REGEX_REPLACE('foobar', 'oo|ar', f33)",
+      "null")
+  }
+
 
 Review comment:
   what about `"fooor".regexReplace("oo", "")`? is it `"for"` or `"fr"`? the 
problem is what about the complicated/corner case, which maybe worth a test to 
cover it.

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