Java String Escape escapeRegexChars(String str, char... ignores)

Description

escape Regex Chars

License

Apache License

Declaration

public static final String escapeRegexChars(String str, char... ignores) 

Method Source Code

//package com.java2s;
/*/*  w ww .j av a 2 s  .c  o m*/
 * Copyright Bruce Liang (ldcsaa@gmail.com)
 *
 * Version   : Log-Cutter 2.0.2
 * Author   : Bruce Liang
 * Website   : http://www.jessma.org
 * Project   : https://github.com/ldcsaa
 * Blog      : http://www.cnblogs.com/ldcsaa
 * WeiBo   : http://weibo.com/u/1402935851
 * QQ Group   : 75375912
 *
 * 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
 *
 *      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.
 */

import java.util.HashSet;
import java.util.Iterator;

import java.util.Set;

public class Main {

    public static final String escapeRegexChars(String str, char... ignores) {
        final char ESCAPE_CHAR = '\\';
        final char[] REGEX_CHARS = { '.', ',', '?', '+', '-', '*', '^', '$', '|', '&', '{', '}', '[', ']', '(', ')',
                '\\' };

        char[] regex_chars = REGEX_CHARS;

        if (ignores.length > 0) {
            Set<Character> cs = new HashSet<Character>(REGEX_CHARS.length);

            for (int i = 0; i < REGEX_CHARS.length; i++)
                cs.add(REGEX_CHARS[i]);
            for (int i = 0; i < ignores.length; i++)
                cs.remove(ignores[i]);

            int i = 0;
            regex_chars = new char[cs.size()];
            Iterator<Character> it = cs.iterator();

            while (it.hasNext())
                regex_chars[i++] = it.next();
        }

        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);

            for (int j = 0; j < regex_chars.length; j++) {
                if (c == regex_chars[j]) {
                    sb.append(ESCAPE_CHAR);
                    break;
                }
            }

            sb.append(c);
        }

        return sb.toString();
    }
}

Related

1. escapeInstanceIdentifier(String instanceIdentifier)
2. escapeJavaString(String str)
3. escapeJavaStyleString(StringBuilder out, String str, boolean escapeSingleQuote, boolean escapeForwardSlash)
4. escapeQuotes(String string)
5. escapeRegex(String regex)
6. escapeRegexp(final String str)
7. escapeRegexpSymbol(String expr)
8. escapeReservedWord(String input)
9. escapeSelected(String str, String chars)