Re: Regex problem

From:
Patricia Shanahan <pats@acm.org>
Newsgroups:
comp.lang.java.help
Date:
Wed, 10 Oct 2007 17:05:59 -0700
Message-ID:
<13gqq7gsfho2ke3@corp.supernews.com>
Roedy Green wrote:

On Wed, 10 Oct 2007 16:44:13 +0200, Hendrik Maryns
<hendrik_maryns@despammed.com> wrote, quoted or indirectly quoted
someone who said :

I acknowledge that, but I would like to process the file sequentially,
and I see no immediate possibility to do it as you suggest without
reading in the whole file, which is otherwise unnecessary.

Could you elaborate a little bit how this would work?


I don't have a complete solution, but you could read the first N
chars of the file, the do a startsWith.


In the original message, Hendrik Maryns said:

I want to discard the header of some file. The header is everything
before a line beginning with "#BOS". However, I do not want #BOS to be
part of the match, since I need it later on.


If the end of header is a line, why not read the file a line at a time,
using a BufferedReader? Write a very simple regex that matches any line
beginning with "#BOS", or apply startsWith to each line. Discard lines
until one matches, then go into normal processing beginning with that line.

Patricia

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