| /* | |
| * 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 org.apache.commons.mail.re; | |
| /** This package provides helper classes, that are designed to replace | |
| * regular expressions, like | |
| * <pre> | |
| * (<[Ii][Mm][Gg]\\s*[^>]*?\\s+[Ss][Rr][Cc]\\s*=\\s*[\"'])([^\"']+?)([\"']) | |
| * </pre> | |
| * The reason for using the helper classes, and not a simple regular | |
| * expression is a performance problem of the latter, that we wish to overcome. | |
| * The main idea of the helper class is to divide the regular expression into a | |
| * cascade of so-called matchers. A matcher replaces a comparatively simple | |
| * subexpression, like <pre>\\s*</pre>. The simplicity of the replaced expression | |
| * allows a manual, performace optimized implementation of the corresponding | |
| * matcher. | |
| */ |