Java String Extract extractWords(String s)

Description

extract Words

License

Apache License

Declaration

public static String[] extractWords(String s) 

Method Source Code

//package com.java2s;
/*//w  w w.  j  a  v  a  2  s . c om
 * Copyright 2016 Nuke Sparrow <nukesparrow@bitmessage.ch>.
 *
 * 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.ArrayList;

public class Main {
    public static String[] extractWords(String s) {
        ArrayList<String> words = new ArrayList<>();

        StringBuilder b = new StringBuilder();
        char prev = 0;

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

            if (Character.isAlphabetic(c) || Character.isDigit(c)) {
                if ((!(Character.isLowerCase(c) && Character.isUpperCase(prev)))
                        && ((Character.isUpperCase(c) && !Character.isUpperCase(prev))
                                || (Character.getType(c) != Character.getType(prev)))) {

                    if (b.length() > 0) {
                        words.add(b.toString());
                        b.setLength(0);
                    }
                }
                b.append(c);
            } else {
                if (b.length() > 0) {
                    words.add(b.toString());
                    b.setLength(0);
                }
            }

            prev = c;
        }

        if (b.length() > 0)
            words.add(b.toString());

        return words.toArray(new String[0]);
    }
}

Related

1. extractStrings(String s)
2. extractStringsAroundDots(String s)
3. extractTableName(String line)
4. extractTags(Map layoutProperties)
5. extractUmiPositions(String pattern)