Groups > comp.lang.java.programmer > #5010

Re: Confusion about String.matches method

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Date	Mon, 06 Jun 2011 20:18:24 +1000
From	Esmond Pitt <esmond.pitt@bigpond.com>
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Subject	Re: Confusion about String.matches method
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On 6/06/2011 5:50 PM, Roedy Green wrote:
> On Wed, 01 Jun 2011 16:02:16 +0100, Nigel Wade<nmw-news@ion.le.ac.uk>
> 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.

> If you are trying to match a eol char in a regex the two chars in ram
> will be \ n
>
> If you are creating a string literal it will be "\\n"

And if you are creating a regex it will be "\\\\n".

> The extra \ is to tell Java this is not a Java literal.

And the doubled \\ are there to tell the regex this is a backslashed 
backslash, i.e. a real backslash, not a regex escape.

> The easy way to create these strings is to use Quoter.

I don't see how any piece of software can understand whether a quoted 
string is for use in a regular expression or not.

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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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