Java使用正则表达式检索、替换String中特定字符和正则表达式的一切

public static String getNonBlankStr(String str) {  
  if(str!=null && !"".equals(str)) {  
   Pattern pattern = Pattern.compile("\\s*|\t|\r|\n"); //去掉空格符合换行符  
   Matcher matcher = pattern.matcher(str);  
   String result = matcher.replaceAll("");  
   return result;  
  }else {  
   return str;  
  }   
 } 

public  static  String StringFilter(String  str)  throws PatternSyntaxException {
 
  // String  regEx = "[^a-zA-Z0-9]"; // 只允许字母和数字
  // 清除掉所有特殊字符(除了~之外)
  String regEx="[`!@#$%^&*()+=|{}':;',//[//].<>/?！@#￥%……&*（）——+|{}【】‘；：”“'。，、？]";
  Pattern pattern  =  Pattern.compile(regEx);
  Matcher matcher  =  pattern.matcher(str);
  return  matcher.replaceAll("").trim();
}

public  static  String StringFilter(String  str)  throws PatternSyntaxException {
 
  // String  regEx = "[^a-zA-Z0-9]"; // 只允许字母和数字
  // 清除掉所有特殊字符(除了~之外)
  String regEx="[`!@#$%^&*()+=|{}':;',//[//].<>/?！@#￥%……&*（）——+|{}【】‘；：”“'。，、？]";
  Pattern pattern  =  Pattern.compile(regEx);
  Matcher matcher  =  pattern.matcher(str);
  return  matcher.replaceAll("").trim();
}

/**
* 结果：element = grjk Text 
element = wwwdsf 
element = Many 
element = egsdg r geg
*/
String text = "A reg grjk Text reg wwwdsf reg Many reg egsdg r geg";
String patternString = "reg";
Pattern pattern = Pattern.compile(patternString);
String[] split = pattern.split(text);
for(String element : split){
  System.out.println("element = " + element);
}

/**
*结果：found: 1 : 2 - 4
found: 2 : 5 - 7
found: 3 : 23 - 25
found: 4 : 70 - 72
*/
String text  ="This is the text which is to be searched " +"for occurrences of the word 'is'.";				
String patternString = "is";				
Pattern pattern = Pattern.compile(patternString);				
Matcher matcher = pattern.matcher(text);
int count = 0;
while(matcher.find()) {				
  count++;				
  System.out.println("found: " + count + " : " + matcher.start() + " - " + matcher.end());				
}

		Pattern pattern = Pattern.compile("[0-9]*");//判断是否都是数字
    Matcher isNum = pattern.matcher("1123是数字");
    if(isNum.matches()) {
      System.out.println("全部是数字");
    } else {
      System.out.println("有汉字");
    }

		//匹配任意字符串中包含形如“@数字&”格式的子串
		String st="看，墙面上的雕塑是什么？@322&大家一定猜到了，这是一个神经元。汇区的研院校及企业资源，促进产学研医多个环节上的相互合作与交融";
		Pattern pattern = Pattern.compile("^(.*)@-?[1-9]\\d*&(.*)$"); //去掉空格符合换行符
		 Matcher matcher = pattern.matcher(st);
		 boolean result = matcher.find();