Java模式匹配正则表达式

Question

我正在做模式匹配matcher.matches来作为false，而matcher.replaceAll实际上找到了模式并将其替换。此外，matcher.group（1）正在返回一个异常。

@Test 
public void testname() throws Exception { 
    Pattern p = Pattern.compile("<DOCUMENT>(.*)</DOCUMENT>"); 
    Matcher m = p.matcher("<RESPONSE><DOCUMENT>SDFS878SDF87DSF</DOCUMENT></RESPONSE>"); 
    System.out.println("Why is this false=" + m.matches()); 
    String s = m.replaceAll("HEY"); 
    System.out.println("But replaceAll found it="+s); 

} 

我需要matcher.matches（）返回true，并且matcher.group（1）提前返回 “< DOCUMENT> SDFS878SDF87DSF </DOCUMENT>”

感谢您的帮助。

Answer 1

final Pattern pattern = Pattern.compile("<DOCUMENT>(.+?)</DOCUMENT>"); 
final Matcher matcher = pattern.matcher("<RESPONSE><DOCUMENT>SDFS878SDF87DSF</DOCUMENT></RESPONSE>"); 
if (matcher.find()) 
{ 
    System.out.println(matcher.group(1)); 
    // code to replace and inject new value between the <DOCUMENT> tags 
}