Uniform implementation of String.replace and String.matches(Regex) across JVM and JS.

Deprecated String.matches(String) and String.replaceAll methods.

libraries/stdlib/test/text/StringTest.kt

@@ -527,4 +527,14 @@ class StringTest {
         assertFalse("sample".equals("Sample", ignoreCase = false))
         assertTrue("sample".equals("Sample", ignoreCase = true))
     }
+
+
+    test fun replace() {
+        val input = "abbAb"
+        assertEquals("abb${'$'}b", input.replace('A', '$'))
+        assertEquals("/bb/b", input.replace('A', '/', ignoreCase = true))
+
+        assertEquals("${'$'}bAb", input.replace("ab", "$"))
+        assertEquals("/b/", input.replace("ab", "/", ignoreCase = true))
+    }
 }