Test octal literal in regex

libraries/stdlib/test/text/RegexTest.kt

@@ -9,6 +9,7 @@ package test.text
 
 import test.regexSplitUnicodeCodePointHandling
 import test.supportsNamedCapturingGroup
+import test.supportsOctalLiteralInRegex
 import test.BackReferenceHandling
 import test.HandlingOption
 import kotlin.test.*
@@ -242,6 +243,14 @@ class RegexTest {
         testInvalidBackReference(BackReferenceHandling.notYetDefinedGroup, pattern = "a\\1(a)")
     }
 
+    @Test fun matchCharWithOctalValue() {
+        if (supportsOctalLiteralInRegex) {
+            assertEquals("aa", "a\\0141".toRegex().find("aaaa")?.value)
+        } else {
+            assertFails { "a\\0141".toRegex() }
+        }
+    }
+
     @Test fun matchNamedGroupsWithBackReference() {
         if (!supportsNamedCapturingGroup) return