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How to use regular expressions to filter special characters in java

Nov 26, 2019 pm 12:50 PM
javaregular expressionSpecial charactersfilter

How to use regular expressions to filter special characters in java

实例代码如下:

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public class FilterSpecialStr {
 
  public static void main(String[] args) {
 
    String regEx="[\n`~!@#$%^&*()+=|{}&#39;:;&#39;,\\[\\].<>/?~!@#¥%……&*()——+|{}【】‘;:”“’。, 、?]";
    // 除了字母数字下划线之外的字符为非法字符
    Pattern pattern = Pattern.compile(regEx);
    // 指定设置非法字符
    // Pattern pattern = Pattern.compile("[@#]");
    String str = "123@abc {}  \n  #D     EF。";
    Matcher matcher = pattern.matcher(str);
    StringBuffer buffer = new StringBuffer();
    //如果找到非法字符
    while (matcher.find()) {
    // 如果里面包含非法字符如冒号双引号等,那么就把他们消去,并把非法字符前面的字符放到缓冲区
      matcher.appendReplacement(buffer, "");
    }
    // 将剩余的合法部分添加到缓冲区
    matcher.appendTail(buffer);
    System.out.println("过滤前的字符: " + str);
    System.out.println("过滤后的字符: " + buffer.toString());
  }
 
 
}

输出的结果:

过滤前的字符: 123@abc {}  
  #D     EF。
过滤后的字符: 123abcDEF

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