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 package org.apache.logging.log4j.core.util; 18 19 /** 20 * Pattern strings used throughout Log4j. 21 * 22 * @see java.util.regex.Pattern 23 */ 24 public final class Patterns { 25 26 /** 27 * A pattern string for comma separated lists with optional whitespace. 28 */ 29 public static final String COMMA_SEPARATOR = toWhitespaceSeparator(","); 30 31 /** 32 * The whitespace pattern string. 33 */ 34 public static final String WHITESPACE = "\\s*"; 35 36 private Patterns() { 37 } 38 39 /** 40 * Creates a pattern string for {@code separator} surrounded by whitespace. 41 * 42 * @param separator The separator. 43 * @return a pattern for {@code separator} surrounded by whitespace. 44 */ 45 public static String toWhitespaceSeparator(final String separator) { 46 return WHITESPACE + separator + WHITESPACE; 47 } 48 }