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Groups > comp.lang.java.programmer > #5083

Re: Confusion about String.matches method

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On Mon, 06 Jun 2011 20:18:24 +1000, Esmond Pitt
<esmond.pitt@bigpond.com> wrote, quoted or indirectly quoted someone
who said :

>>> So, to get your '\\n' in the RE you need to
>>> have '\\\\n' in the string.
>>
>> Oops.
>
>No 'oops' about it. The poster is correct.


I presumed you are trying to match a single 0x0a, the usual case.

If you were going to look for it without regexes you would look for
"\n".

If you wanted a regex you want the two chars \ and n in the regex
string.

However, if you do that, Java will think \ is an escape char, so you
need to escape the escape: 

"\\n"

If you were trying to scan for the pair of characters \ n
then it gets weird since \ is a escape character both in Java and in
Regex.  You scan for
"\\\\n"

Someday we will stop using "in-band" controls and the goofy quoting
problems will go away.  You could use two "colours" one for commands
and one for data. We are hamstringing ourselved by imagining our
programming tools are limited to TTYs.
-- 
Roedy Green Canadian Mind Products
http://mindprod.com
How long did it take after the car was invented before owners understood 
cars would not work unless you regularly changed the oil and the tires?
We have gone 33 years and still it is rare to uncover a user who 
understands computers don't work without regular backups.

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Thread

Confusion about String.matches method laredotornado <laredotornado@zipmail.com> - 2011-05-31 10:24 -0700
  Re: Confusion about String.matches method Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-31 17:28 +0000
    Re: Confusion about String.matches method laredotornado <laredotornado@zipmail.com> - 2011-05-31 13:15 -0700
      Re: Confusion about String.matches method Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-05-31 23:10 +0200
      Re: Confusion about String.matches method Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-31 21:26 +0000
      Re: Confusion about String.matches method Ian Shef <invalid@avoiding.spam> - 2011-05-31 22:20 +0000
      Re: Confusion about String.matches method Roedy Green <see_website@mindprod.com.invalid> - 2011-05-31 15:53 -0700
        Re: Confusion about String.matches method laredotornado <laredotornado@zipmail.com> - 2011-06-01 07:10 -0700
          Re: Confusion about String.matches method Nigel Wade <nmw-news@ion.le.ac.uk> - 2011-06-01 16:02 +0100
            Re: Confusion about String.matches method Roedy Green <see_website@mindprod.com.invalid> - 2011-06-06 00:50 -0700
              Re: Confusion about String.matches method Esmond Pitt <esmond.pitt@bigpond.com> - 2011-06-06 20:18 +1000
                Re: Confusion about String.matches method Roedy Green <see_website@mindprod.com.invalid> - 2011-06-07 21:15 -0700
                Re: Confusion about String.matches method Michael Wojcik <mwojcik@newsguy.com> - 2011-06-08 11:13 -0400
                Re: Confusion about String.matches method Esmond Pitt <esmond.pitt@bigpond.com> - 2011-06-09 19:19 +1000
                Re: Confusion about String.matches method Roedy Green <see_website@mindprod.com.invalid> - 2011-06-07 21:18 -0700
                Re: Confusion about String.matches method Gene Wirchenko <genew@ocis.net> - 2011-06-08 07:50 -0700
              Re: Confusion about String.matches method Nigel Wade <nmw-news@ion.le.ac.uk> - 2011-06-06 12:15 +0100
          Re: Confusion about String.matches method Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-06-01 11:17 -0400
            Re: Confusion about String.matches method Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-06-01 18:59 +0200
          Re: Confusion about String.matches method Ian Shef <invalid@avoiding.spam> - 2011-06-01 19:41 +0000
      Re: Confusion about String.matches method Jim Janney <jjanney@shell.xmission.com> - 2011-06-01 08:41 -0600

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