maybe method now accepts a builder as parameter

Author: Otavio42

src/main/java/ru/lanwen/verbalregex/VerbalExpression.java

@@ -170,6 +170,10 @@ public Builder find(final String value) {
         public Builder maybe(final String pValue) {
             return this.then(pValue).add("?");
         }
+        
+        public Builder maybe(final Builder regex) {
+            return this.group().add(regex.build().toString()).endGr().add("?");
+        }
 
         /**
          * Add expression that matches anything (includes empty string)

src/test/java/ru/lanwen/verbalregex/BasicFunctionalityUnitTest.java

@@ -579,4 +579,20 @@ public void testOneOfWithClosedCapture() {
         assertThat(testRegex.getText("xxxabcdefzzz", 1), equalTo("abcdef"));
         assertThat(testRegex.getText("xxxdefzzz", 1), equalTo("def"));
     }
+    
+    @Test
+    public void shouldAddMaybeWithOneOfFromAnotherBuilder() {
+	VerbalExpression.Builder namePrefix = regex().oneOf("Mr.", "Ms.");
+	VerbalExpression name = regex()
+		.maybe(namePrefix)
+		.space()
+		.zeroOrMore()
+		.word()
+		.oneOrMore()
+		.build();
+	
+	assertThat("Is a name with prefix", name, matchesTo("Mr. Bond"));
+	assertThat("Is a name without prefix", name, matchesTo("James"));
+	
+    }
 }