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s1 = s.replaceAll("[^a-zA-Z|\\-|=]", "");
s2 = s.replaceAll("[a-zA-Z|\\-|=]", "");
System.out.println(s1);
System.out.println(s2);
String s = "a你bc吃早d餐ef了吗g";
String s1 = s.replaceAll("[^a-zA-Z]", "");
String s2 = s.replaceAll("[a-zA-Z]", "");
System.out.println(s1);
System.out.println(s2);
String str="a你bc吃早d餐ef了吗g";
String[] s1=str.split("[a-zA-Z]");//按字母分割
String result1="";
for(int i=0; i<s1.length; i++){
result1+=s1[i];
}
System.out.println(result1);
String result2="";
Pattern p = Pattern.compile("[a-zA-Z]+");//按字母匹配
Matcher m = p.matcher(str);
while(m.find()){
result2+=m.group(0);
}
System.out.println(result2);