[WASM] Regex std implementation

libraries/stdlib/native-wasm/test/harmony_regex/PatternErrorTest.kt

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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package test.text.harmony_regex
+
+import kotlin.text.*
+import kotlin.test.*
+
+class PatternErrorTest {
+
+    @Test fun testCompileErrors() {
+        // empty regex string - no exception should be thrown
+        Regex("")
+
+        // note: invalid regex syntax checked in PatternSyntaxExceptionTest
+
+        // flags = 0 should raise no exception
+        Regex("foo", emptySet())
+
+        // check that all valid flags accepted without exception
+        val options = setOf(
+                RegexOption.UNIX_LINES,
+                RegexOption.IGNORE_CASE,
+                RegexOption.MULTILINE,
+                RegexOption.CANON_EQ,
+                RegexOption.COMMENTS,
+                RegexOption.DOT_MATCHES_ALL)
+        Regex("foo", options)
+    }
+
+}