[JS] Support named capture groups in Regex #KT-51775

libraries/stdlib/js/test/text/RegexJsTest.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package test.text
+
+import kotlin.test.*
+
+class RegexJsTest {
+    @Test
+    fun replace() {
+        // js capturing group name can contain Unicode letters, $, _, and digits (0-9), but may not start with a digit.
+        // jvm capturing group name can contain a-z, A-Z, and 0-9, but may not start with a digit.
+        // make sure reference to capturing group name in K/JS Regex.replace(input, replacement) obeys K/JVM rules
+        val input = "123-456"
+        Regex("(?<first_part>\\d+)-(?<second_part>\\d+)").let { regex ->
+            assertEquals("123/456", regex.replace(input, "$1/$2"))
+            assertEquals("123/456", regex.replaceFirst(input, "$1/$2"))
+
+            assertEquals("123/456", regex.replace(input, "\${first_part}/\${second_part}"))
+            assertEquals("123/456", regex.replaceFirst(input, "\${first_part}/\${second_part}"))
+        }
+        Regex("(?<\$first>\\d+)-(?<\$second>\\d+)").let { regex ->
+            assertEquals("123/456", regex.replace(input, "\${\$first}/\${\$second}"))
+            assertEquals("123/456", regex.replaceFirst(input, "\${\$first}/\${\$second}"))
+
+            assertFailsWith<IllegalArgumentException> { regex.replace(input, "\${first}/\${second}") }
+            assertFailsWith<IllegalArgumentException> { regex.replaceFirst(input, "\${first}/\${second}") }
+        }
+        Regex("(?<first>\\d+)-(?<second>\\d+)").let { regex ->
+            assertFailsWith<IllegalArgumentException> { regex.replace(input, "\${\$first}/\${\$second}") }
+            assertFailsWith<IllegalArgumentException> { regex.replaceFirst(input, "\${\$first}/\${\$second}") }
+        }
+    }
+}