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文檔上說\s表示空白字符 回車算不算空白字符呢
用實際例子測試了一下,不同的環(huán)境結(jié)果各不相同

測試文件內(nèi)容
test.txt
PH
P and JA
VA

$text=file_get_contents('test.txt');



#print $text;


preg_match("/PH\sP/s",$text,$match);
print_r($match);

preg_match("/JA\sVA/s",$text,$match);

print_r($match);

php匹配出來為空

Pattern php =  Pattern.compile("PH\\sP",Pattern.DOTALL);
Pattern java =  Pattern.compile("JA\\sVA",Pattern.DOTALL);
  BufferedReader  in = new BufferedReader(new FileReader("test.txt"));
   StringBuffer  sb=new StringBuffer ();
    String s;

    while ((s = in.readLine()) != null)     {
    sb.append(s);
 }

Matcher m = php.matcher(sb);

while(m.find()) {

      System.out.println(m.group());
}

  m = java.matcher(sb);

while(m.find()) {

      System.out.println(m.group());
}

java都能匹配出來