1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.regexp;
19
20 /**
21 * This is a class that contains utility helper methods for this package.
22 *
23 * @author <a href="mailto:jonl@muppetlabs.com">Jonathan Locke</a>
24 * @version $Id: REUtil.java 518156 2007-03-14 14:31:26Z vgritsenko $
25 */
26 public class REUtil
27 {
28 /** complex: */
29 private static final String complexPrefix = "complex:";
30
31 /**
32 * Creates a regular expression, permitting simple or complex syntax
33 * @param expression The expression, beginning with a prefix if it's complex or
34 * having no prefix if it's simple
35 * @param matchFlags Matching style flags
36 * @return The regular expression object
37 * @exception RESyntaxException thrown in case of error
38 */
39 public static RE createRE(String expression, int matchFlags) throws RESyntaxException
40 {
41 if (expression.startsWith(complexPrefix))
42 {
43 return new RE(expression.substring(complexPrefix.length()), matchFlags);
44 }
45 return new RE(RE.simplePatternToFullRegularExpression(expression), matchFlags);
46 }
47
48 /**
49 * Creates a regular expression, permitting simple or complex syntax
50 * @param expression The expression, beginning with a prefix if it's complex or
51 * having no prefix if it's simple
52 * @return The regular expression object
53 * @exception RESyntaxException thrown in case of error
54 */
55 public static RE createRE(String expression) throws RESyntaxException
56 {
57 return createRE(expression, RE.MATCH_NORMAL);
58 }
59 }
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