java 正则表达式

Question

起始IP                  结束IP                      地区 
61.54.231.245        61.54.231.245          河南省安阳市 新世纪网吧 
61.54.231.246        61.54.231.246          河南省安阳市 未知地区 
61.54.231.9            61.54.231.247          河南省安阳市 红日网吧 
61.54.231.248          61.54.231.248          河南省安阳市 安阳师范学院 
61.54.231.249          61.54.231.249        河南省安阳市 黑蜘蛛网吧(师范学院附近) 用Java正则表达式把这个替换成类似  061.054.231.245，061.054.231.245， 河南省安阳市 新世纪网吧就是一个IP后弄个逗号，不够3位的在前面补上零。
我这样弄的，可能复杂了，请高手简化一下，谢谢了。
bReader = new BufferedReader(new FileReader("D:\\download\\a.txt"));
bWriter = new BufferedWriter(new FileWriter("f:\\b.txt"));
String string = null;
while ((string = bReader.readLine()) != null) {
bWriter.write(string.replaceAll("(?<=\\d)\\s+", ",")
.replaceAll("(?<=\\D)(\\d{1})(?=(,|\\.))", "00$1")
.replaceAll("(?<=\\D)(\\d{2})(?=(,|\\.))", "0$1")
.replaceAll("(^\\d{1})(?=\\.)", "00$1").replaceAll(
("(^\\d{2})"), "0$1"));
// bWriter.write(string.replaceAll("(?<=\\d)\\s+", ",  "));
// bWriter.write(string.replaceAll("(?<=\\d)\\s+",
// ",  ").replaceAll("(\\d{1}+)(?=,|\\.)", "00$1"));
bWriter.newLine();

Answer 1

public class RegexTest {
public static void main(String[] args) {
String str="61.54.231.245        61.54.231.245          河南省安阳市 新世纪网吧 ";
String s[]=str.split("(\\s+(?=\\d))|((?<=\\d)\\s+)");
String s_1[]=s[0].split("\\.");
String result="";
for(int i=0;i<s_1.length;i++){
s_1[i]=((Integer.parseInt(s_1[i])+1000)+"").substring(1);
if(i!=s_1.length-1){
result+=s_1[i]+".";
}else{
result+=s_1[i]+",";
}
}
String s_2[]=s[1].split("\\.");
for(int i=0;i<s_2.length;i++){
s_2[i]=((Integer.parseInt(s_2[i])+1000)+"").substring(1);
if(i!=s_1.length-1){
result+=s_2[i]+".";
}else{
result+=s_2[i]+" ";
}
}
result+=s[2];
System.out.println(result);
}}061.054.231.245,061.054.231.245 河南省安阳市 新世纪网吧 
没有必要完全用正则

Answer 2

String[] strArr = {"61.54.231.245        61.54.231.245          河南省安阳市 新世纪网吧",
"61.54.231.246        61.54.231.246          河南省安阳市 未知地区",
"61.54.231.9            61.54.231.247          河南省安阳市 红日网吧",
"61.54.231.248          61.54.231.248          河南省安阳市 安阳师范学院",
"61.54.231.249          61.54.231.249        河南省安阳市 黑蜘蛛网吧(师范学院附近)" };
for (int i=0;i<strArr.length;i++)
{
strArr[i] = strArr[i].replaceAll("(?<=\\d)\\s+",",")
.replaceAll("(?<=^|\\.|,)(\\d{1})(?=\\.|,)","00$1")
.replaceAll("(?<=^|\\.|,)(\\d{2})(?=\\.|,)","0$1");
}
for (String str:strArr)
{
System.out.println(str);
}