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18.String s = "113@ ere qqq yyui"
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113
ere
qqq
yyui


19. ±àдһ¸ö³ÌÐò£¬½«ÏÂÃæµÄÒ»¶ÎÎı¾Öеĸ÷¸öµ¥´ÊµÄ×Öĸ˳Ðò·­×ª£¬
¡°To be or not to be"£¬½«±ä³É"oT eb ro ton ot eb."¡£

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18:
String[] subs = s.split("[@\\s]");
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19:

String[] subs = s.split("\\s");
for(String sub:subs){
  StringBuilder sb = new StringBuilder (sub);
  System.out.println(sb.reverse().toString());
}

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[cod public static void main(String[] args) throws Exception {

String s = "113@ ere qqq yyui";
s=s.replaceAll("[^a-zA-Z 0-9]", "");
for (String str: s.split(" ")) {
  System.out.println(str);
  }


//ĩβ±êµãÊDz»ÊDz»Òª·´×ª£¿
s = "To be or not to be.";//"oT eb ro ton ot eb."¡£
StringBuffer sBuffer = new StringBuffer();
for (String str: s.split("\\s")) {
char punctuate=' ';
  char[] chars = str.toCharArray();
  for (int i = chars.length-1;i>=0;i--) {
  if (i==chars.length-1 && !Character.isLetter(chars[i])) {
  punctuate = chars[i];
  continue;