removing lines

[Jesus Angeles]

Hello

How do I remove (totally remove the entire line), whose first non-space non-tab chars are "</".

Such that:

  
<MOTHER>
      <AAAABA39>
            <AAAABA3A>
                <XXXXK030-READ></XXXXK030-READ>
            </AAAABA3A>
      </AAAABA39>
</MOTHER>
               

becomes

  
<MOTHER>
      <AAAABA39>
            <AAAABA3A>
                <XXXXK030-READ></XXXXK030-READ>
               

Any existing editor who can do this? Or any steps or procedure to do it?
[ January 14, 2007: Message edited by: Jesus Angeles ]

[Henry Wong]

"vi" and it's variants can easily do this, with a "g/regex/d" command. Unfortuantely, it uses a variant of regular expressions that is different from the one provided in Java -- so you'll have to do a little research if you never used that editor before.

Henry

[Jesus Angeles]

Is there vi for windows? I saw unix when I searched. Thanks. I will look at it.

Another way is this, I just coded:

 package A;
 
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
 
public class tryAA {
 
public static void main(String[] args) {
String before;
try {
 
File fromFile = new File("c:/in.xml"); // File to read from.
//File toFile = new File("out.txt");  // File to write to
 
BufferedReader reader =
new BufferedReader(new FileReader(fromFile));
//BufferedWriter writer = new BufferedWriter(new FileWriter(toFile));
 
//... Loop as long as there are input lines.
String line = null;
while ((line = reader.readLine()) != null) {
//writer.write(line);
//writer.newLine();   // Write system dependent end of line.
before = charBefore(line);
if (before == null)
System.out.println(line);
else if (before.equals("")) {
} else if (before.equals(">")) {
System.out.println(line.substring(0, line.indexOf("</")));
} else {
}
}
reader.close(); // Close to unlock.
//writer.close();  // Close to unlock and flush to disk.
 
} catch (Exception e) {
System.out.println("exception yata");
}
}
 
public static String charBefore(String args) {
 
int a = args.indexOf("</");
//System.out.println("" + a);
if (a == -1) {
return null;
} else if (a == 0) {
return "";
} else {
return args.substring(a - 1, a);
}
 
}
 
}
   

[Henry Wong]

Is there vi for windows? I saw unix when I searched. Thanks. I will look at it.

Another way is this, I just coded:

Yes, there is a version for windows... but personally, I wouldn't go learn it just for one command. For editors, it is somewhat of an acquired taste.

BTW, if you went through the trouble of writing a program, then aren't you done? ... Also, with regex, the program can be somewhat shorter.

File fromFile = new File("in.xml");
File toFile = new File("out.txt");
BufferedReader reader = new BufferedReader(new FileReader(fromFile));
BufferedWriter writer = new BufferedWriter(new FileWriter(toFile));
 
for (String line = reader.readLine(); line != null; line = reader.readLine())
    if (!line.matches("\\s*</.*")) writer.write(line + "\n");
 
reader.close();
writer.flush(); writer.close();

Henry