using Regex

[ramesh akula]

hi
i have one text document(*.txt) file it contains some rows and columns
my requirement is that i have to remove some rows in that file

for example : ( my text file contain the below data)
---------------------------
N10 X-10.256 Y23.675
N11 X-23.563 Y45.078
N12 X34.567
N13 Y-56.774
N14 X-34.876 Y-23.878 F100
----------------------------
i want to delete sequence numbers that is N10,N11,N12,N13,N14.
so using REGEX can we do something ???

please helpme out

[Henry Wong]

Ramesh,

I would highly recommend that you pick up a book about regular expressions (or google for a tutorial). Regular expressions are incredibly powerful, and can't really be learned easily with examples.

But to answer your question... assuming that you have one line of the file in a string, here is how regex can be used to remove the first field...

public static String removeFirstField(String line) {
  return line.replaceFirst("^\\S+\\s*(.*)$", "$1");
}

Henry

[Henry Wong]

Okay, got a bit too fancy there. Here is a much simpler version...

public static String removeFirstField(String line) {
  return line.replaceFirst("\\S+\\s*", "");
}

Henry