unity c#非法字符（脏词）检测

项目中非法字符检测是必须的，聊天系统不屏蔽各种不文明用语

先说说我的原理吧

1.读取非法字符表，把相同的首字符归类到字典，类似新华字典那样

2.然后把输入的字符串，一个个字符找对应的首字符字典，遍历首字符字典，在当前字符后面截取对应的字符长度得到的字符串然后比较，如果字符串相同则认为有非法字符

下面是测试结果

下面为完整代码，有注释应该比较容易看懂


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine;/// <summary>
/// 非法关键词过滤(自动忽略汉字数字字母间的其他字符)
/// </summary>
public class FilterWord
{public FilterWord(){TextAsset asset = Resources.Load("dirtywords") as TextAsset;m_AllFilterWord = asset.text;}private string m_AllFilterWord = string.Empty;/// <summary>/// 词库路径/// </summary>public string AllFilterWord{get { return m_AllFilterWord; }set { m_AllFilterWord = value; }}/// <summary>/// 内存词典/// </summary>private WordGroup[] MEMORYLEXICON = new WordGroup[(int)char.MaxValue];private string sourctText = string.Empty;private bool m_IsInitalize = false;/// <summary>/// 检测源/// </summary>public string SourceText{get { return sourctText; }set { sourctText = value; }}/// <summary>/// 检测源游标/// </summary>int cursor = 0;/// <summary>/// 匹配成功后偏移量/// </summary>int wordlenght = 0;/// <summary>/// 检测词游标/// </summary>int nextCursor = 0;private List<string> illegalWords = new List<string>();/// <summary>/// 检测到的非法词集/// </summary>public List<string> IllegalWords{get { return illegalWords; }}/// <summary>/// 判断是否是中文/// </summary>/// <param name="character"></param>/// <returns></returns>private bool isCHS(char character){//  中文表意字符的范围 4E00-9FA5int charVal = (int)character;return (charVal >= 0x4e00 && charVal <= 0x9fa5);}/// <summary>/// 判断是否是数字/// </summary>/// <param name="character"></param>/// <returns></returns>private bool isNum(char character){int charVal = (int)character;return (charVal >= 48 && charVal <= 57);}/// <summary>/// 判断是否是字母/// </summary>/// <param name="character"></param>/// <returns></returns>private bool isAlphabet(char character){int charVal = (int)character;return ((charVal >= 97 && charVal <= 122) || (charVal >= 65 && charVal <= 90));}/// <summary>/// 转半角小写的函数(DBC case)/// </summary>/// <param name="input">任意字符串</param>/// <returns>半角字符串</returns>///<remarks>///全角空格为12288，半角空格为32///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248///</remarks>private string ToDBC(string input){char[] c = input.ToCharArray();for (int i = 0; i < c.Length; i++){if (c[i] == 12288){c[i] = (char)32;continue;}if (c[i] > 65280 && c[i] < 65375)c[i] = (char)(c[i] - 65248);}return new string(c).ToLower();}/// <summary>/// 加载内存词库/// </summary>public void LoadDictionary(){if (m_IsInitalize){return;}m_IsInitalize = true;List<string> wordList = new List<string>();Array.Clear(MEMORYLEXICON, 0, MEMORYLEXICON.Length);string[] words = AllFilterWord.Split('\n');foreach (string word in words){string str = word.Replace("\r", "");string key = this.ToDBC(str);wordList.Add(key);}Comparison<string> cmp = delegate (string key1, string key2){return key1.CompareTo(key2);};wordList.Sort(cmp);for (int i = wordList.Count - 1; i > 0; i--){if (wordList[i].ToString() == wordList[i - 1].ToString()){wordList.RemoveAt(i);}}foreach (var word in wordList){if (string.IsNullOrEmpty(word)){continue;}WordGroup group = MEMORYLEXICON[word[0]];if (group == null){group = new WordGroup();MEMORYLEXICON[(int)word[0]] = group;}group.Add(word.Substring(1));}}/// <summary>/// 检测/// </summary>/// <param name="blackWord"></param>/// <returns></returns>private bool Check(string blackWord){wordlenght = 0;//检测源下一位游标nextCursor = cursor + 1;bool found = false;string tempStr = ToDBC(sourctText);//遍历词的每一位做匹配for (int i = 0; i < blackWord.Length; i++){//特殊字符偏移游标int offset = 0;if (nextCursor >= tempStr.Length){break;}else{if (i >= blackWord.Length|| nextCursor + offset >= tempStr.Length){found = false;break;}if ((int)blackWord[i] == (int)tempStr[nextCursor + offset]){if (isAlphabet(tempStr[nextCursor + offset])){if(tempStr.Length < blackWord.Length){found = false;break;}if (i >= blackWord.Length - 1){int temp = nextCursor + offset + 1;if(tempStr.Length > temp){if(isAlphabet(tempStr[temp])){found = false;break;}else{found = true;}}else{found = true;}}}else{if (i >= blackWord.Length - 1){found = true;}}}else{found = false;break;}}nextCursor = nextCursor + 1 + offset;wordlenght++;}return found;}/// <summary>/// 查找并替换/// </summary>/// <param name="replaceChar"></param>public string Filter(char replaceChar){cursor = 0;nextCursor = 0;LoadDictionary();if (sourctText != string.Empty){//sourctText = sourctText.Replace("\n", "");//sourctText = sourctText.Trim();char[] tempString = sourctText.ToCharArray();for (int i = 0; i < SourceText.Length; i++){//查询以该字为首字符的词组WordGroup group = MEMORYLEXICON[(int)ToDBC(SourceText)[i]];if (group != null){for (int z = 0; z < group.Count(); z++){string word = group.GetWord(z);if (word.Length == 0 || Check(word)){string blackword = string.Empty;for (int pos = 0; pos < wordlenght + 1; pos++){blackword += tempString[pos + cursor].ToString();tempString[pos + cursor] = replaceChar;}illegalWords.Add(blackword);cursor = cursor + wordlenght;i = i + wordlenght;}}}cursor++;}return new string(tempString);}else{return string.Empty;}}
}/// <summary>
/// 具有相同首字符的词组集合
/// </summary>
class WordGroup
{/// <summary>/// 集合/// </summary>private List<string> groupList;public WordGroup(){groupList = new List<string>();}/// <summary>/// 添加词/// </summary>/// <param name="word"></param>public void Add(string word){groupList.Add(word);}/// <summary>/// 获取总数/// </summary>/// <returns></returns>public int Count(){return groupList.Count;}/// <summary>/// 根据下标获取词/// </summary>/// <param name="index"></param>/// <returns></returns>public string GetWord(int index){return groupList[index];}
}

下面是抽出一个统一方法来调用检测

主要两个方法

1.检测是否有非法字符，返回bool

2.把非法字符转成*号，返回string

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class SystemUtil
{/// <summary>/// 判断是否非法字符/// </summary>/// <param name="str"></param>/// <returns></returns>public static bool IsInvaild(string str){string source = Filter(str);return str != source;}/// <summary>/// 把非法字符变成*号/// </summary>/// <param name="str"></param>/// <returns></returns>public static string Filter(string str){filterWord.SourceText = str;return filterWord.Filter('*');}public static FilterWord filterWord{get{if (null == m_FilterWord){m_FilterWord = new FilterWord();}return m_FilterWord;}}private static FilterWord m_FilterWord;
}

下面是工程下载地址

https://gitee.com/PieKen/FilterWord

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