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ak44/src/test/java/Tptogiar/calculcator/ExampleUnitTest.java

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+package Tptogiar.calculcator;
+
+import org.junit.Test;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+
+    @Test
+    public void TestPattern(){
+//
+        Pattern compile = Pattern.compile( "^(\\-|\\+)?\\d+(\\.\\d+)?$");
+        String a="+45.5";
+        boolean matches = compile.matcher(a).matches();
+        System.out.println(matches);
+        String result = compile.matcher(a).replaceAll("");
+        System.out.println(result);
+
+
+    }
+
+
+}