/*
 * Copyright 2013-2020 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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.springframework.cloud.contract.spec.util;

import java.util.regex.Pattern;

/**
 * Useful utility methods to work with regular expressions.
 *
 * @since 1.0.2
 */
public final class RegexpUtils {

	private RegexpUtils() {
		throw new IllegalStateException("Can't instantiate a utility class");
	}

	public static String escapeSpecialRegexChars(String str) {
		return SPECIAL_REGEX_CHARS.matcher(str).replaceAll("\\\\\\\\$0");
	}

	public static String escapeSpecialRegexWithSingleEscape(String str) {
		return SPECIAL_REGEX_CHARS.matcher(str).replaceAll("\\\\$0");
	}

	private static final Pattern SPECIAL_REGEX_CHARS = Pattern.compile("[{}()\\[\\].+*?^$\\\\|]");

}
