Fix JDK7 failing tests

libraries/stdlib/jvm/test/testUtilsJVM.kt

@@ -41,7 +41,8 @@ public actual val isFloat32RangeEnforced: Boolean = true
 
 public actual val supportsSuppressedExceptions: Boolean get() = !isJava6
 
-public actual val supportsNamedCapturingGroup: Boolean get() = !isJava6
+// Named capturing groups are supported starting from java 7. However, retrieving them by name is not supported in java 7.
+public actual val supportsNamedCapturingGroup: Boolean get() = isJava8AndAbove
 
 public actual val supportsOctalLiteralInRegex: Boolean get() = true
 

libraries/stdlib/test/text/RegexTest.kt

@@ -460,13 +460,7 @@ class RegexTest {
     }
 
     @Test fun replaceWithNamedGroups() {
-        if (!supportsNamedCapturingGroup) {
-            assertFails {
-                val pattern = Regex("(?<first>\\d+)-(?<second>\\d+)")
-                pattern.replace("123-456", "\${first}+\${second}")
-            }
-            return
-        }
+        if (!supportsNamedCapturingGroup) return
 
         val pattern = Regex("(?<first>\\d+)-(?<second>\\d+)")