The example of Java regular expression-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_13110/article/details/82544803

本文提供了一个Java类CommonInjection，用于检测并修复常见的注入漏洞，通过使用正则表达式匹配并进行URL编码操作，确保字符串安全。

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import java.net.URLEncoder;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class CommonInjection {
	//(.*)<[^>]+>(.*)
	//([\\s\\S]*)(?!(<[^>]+>))([\\s\\S]*)
	//(?!.*<[^>]+>.*).*
	public static final Pattern common_pattern=Pattern.compile("(?![\\s\\S]*<[\\s\\S]+>[\\s\\S]*)[\\s\\S]*");
	//public static final String common_pattern_string = "[\\s\\S]*(?=ing)";

	public static String fixCommonInjection(String infoStr) throws Exception{
		if(infoStr == null){
			return null;
		}

		Matcher matcher = common_pattern.matcher(infoStr);
		if(matcher.matches()){
//		if(infoStr.matches(common_pattern_string)){
			System.out.println("***********");
			infoStr = URLEncoder.encode(infoStr, "UTF-8");
			System.out.println("Matched " + infoStr);
		}
		System.out.println("Not Mathed " + infoStr);
		return infoStr;
	}

	public static void main(String[] args) throws Exception{
		String infoStr = "script>HKJHfinfasdfing\r\nscript>\r\nTESt\r\n/script>fsafa\r\n/script><a>";
		CommonInjection.fixCommonInjection(infoStr);
	}

	 /*public static void main(String[] args) {  
	        String str = "HKJHfing";  
	        String regex = "\\S(?=ing)";  
	        String[] strs = str.split(regex);  
	        for(int i = 0; i < strs.length; i++) {  
	            System.out.printf("strs[%d] = %s%n", i, strs[i]);  
	        }  
	    }  */
}