java正则表达式基本用法，java正则表达式,Pattern p =

java正则表达式基本用法，java正则表达式,Pattern p =

Pattern p = Pattern.compile("cat");Matcher m = p.matcher("one cat two cats in the yard");StringBuffer sb = new StringBuffer();while (m.find()) {    m.appendReplacement(sb, "dog");}m.appendTail(sb);System.out.println(sb.toString());String regEx=".+\\\\(.+)$";String str="c:\\dir1\\dir2\\name.txt";Pattern p=Pattern.compile(regEx);Matcher m=p.matcher(str);boolean rs=m.find();for(int i=1;i<=m.groupCount();i++){    System.out.println(m.group(i));}