AlttdGriefPrevention/src/main/java/me/ryanhamshire/GriefPrevention/WordFinder.java

package me.ryanhamshire.GriefPrevention;

import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

class WordFinder
{
    private Pattern pattern;

    WordFinder(List<String> wordsToFind)
    {
        if (wordsToFind.size() == 0) return;

        StringBuilder patternBuilder = new StringBuilder();
        for (String word : wordsToFind)
        {
            if (!word.isEmpty() && !word.trim().isEmpty())
            {
                patternBuilder.append("|(([^\\w]|^)" + Pattern.quote(word) + "([^\\w]|$))");
            }
        }

        String patternString = patternBuilder.toString();
        if (patternString.length() > 1)
        {
            //trim extraneous leading pipe (|)
            patternString = patternString.substring(1);
        }

        this.pattern = Pattern.compile(patternString, Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
    }

    boolean hasMatch(String input)
    {
        if (this.pattern == null) return false;

        Matcher matcher = this.pattern.matcher(input);
        return matcher.find();
    }
}