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regex reserved chars

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  regex reserved chars Roedy Green <see_website@mindprod.com.invalid> - 2013-02-06 16:28 -0800
    Re: regex reserved chars markspace <markspace@nospam.nospam> - 2013-02-06 16:54 -0800
      Re: regex reserved chars Lew <lewbloch@gmail.com> - 2013-02-06 18:03 -0800
        Re: regex reserved chars markspace <markspace@nospam.nospam> - 2013-02-06 18:10 -0800
          Re: regex reserved chars Roedy Green <see_website@mindprod.com.invalid> - 2013-02-06 22:50 -0800
            Re: regex reserved chars markspace <markspace@nospam.nospam> - 2013-02-07 09:32 -0800
              Re: regex reserved chars Gene Wirchenko <genew@telus.net> - 2013-02-07 10:51 -0800
                Re: regex reserved chars markspace <markspace@nospam.nospam> - 2013-02-07 11:53 -0800
                Re: regex reserved chars Arne Vajhøj <arne@vajhoej.dk> - 2013-02-08 20:25 -0500
                Re: regex reserved chars Arne Vajhøj <arne@vajhoej.dk> - 2013-02-08 20:32 -0500
            Re: regex reserved chars Arne Vajhøj <arne@vajhoej.dk> - 2013-02-08 20:17 -0500
        Re: regex reserved chars Roedy Green <see_website@mindprod.com.invalid> - 2013-02-06 23:06 -0800
          Re: regex reserved chars Arne Vajhøj <arne@vajhoej.dk> - 2013-02-08 20:15 -0500
            Re: regex reserved chars Lew <lewbloch@gmail.com> - 2013-02-09 10:43 -0800
    Re: regex reserved chars Arne Vajhøj <arne@vajhoej.dk> - 2013-02-06 20:18 -0500
      Re: regex reserved chars Martin Gregorie <martin@address-in-sig.invalid> - 2013-02-07 21:17 +0000
        Re: regex reserved chars Jim Janney <jjanney@shell.xmission.com> - 2013-02-07 20:47 -0700
          Re: regex reserved chars Martin Gregorie <martin@address-in-sig.invalid> - 2013-02-09 00:50 +0000
        Re: regex reserved chars Arne Vajhøj <arne@vajhoej.dk> - 2013-02-08 20:06 -0500
          Re: regex reserved chars markspace <markspace@nospam.nospam> - 2013-02-08 19:02 -0800
            Re: regex reserved chars Nigel Wade <nmw@ion.le.ac.uk> - 2013-02-11 09:25 +0000
              Re: regex reserved chars markspace <markspace@nospam.nospam> - 2013-02-11 07:16 -0800
                Re: regex reserved chars Nigel Wade <nmw@ion.le.ac.uk> - 2013-02-11 17:12 +0000
    Re: regex reserved chars Roedy Green <see_website@mindprod.com.invalid> - 2013-02-06 23:31 -0800
      Re: regex reserved chars Robert Klemme <shortcutter@googlemail.com> - 2013-02-07 04:38 -0800
      Re: regex reserved chars Arne Vajhøj <arne@vajhoej.dk> - 2013-02-08 20:02 -0500

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#22271

On 09/02/13 03:02, markspace wrote:
> On 2/8/2013 5:06 PM, Arne Vajhøj wrote:
>
>> On 2/7/2013 4:17 PM, Martin Gregorie wrote:
>>> That's normally the first place I look, but it doesn't answer Roedy's
>>> question -
>
>>
>> Actually it does explain that the special characters are different
>> inside and outside.
>>
> ...
>> It did not answer the next question: what is the special
>> characters inside.
>
> I had to double-check this myself, but it does indeed answer the question.  The section on character classes lists all
> the special character classes;  they even order them by precedence for you.
>
> They are:
>
> 1. Literal escape: \
> 2. Grouping: []
> 3. Range: - (as in a-z)
> 4. Union (implicit): [a-e][i-o]
> 5. Intersection: &&
>
> That's it.

Er, not quite. There's also '^' which, as the first character only, negates the match.

Under the section "Character classes":

[^abc] 	Any character except a, b, or c (negation)

-- 
Nigel Wade

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#22273

On 2/11/2013 1:25 AM, Nigel Wade wrote:

> Er, not quite. There's also '^' which, as the first character only,
> negates the match.

Did you read the next paragraph where I mention this?

I wrote:
 > (It appears to me that
 > ^ actually makes a separate token with [, [^, which is different from
 > the non-negated character class.  That's why you can use ^ anywhere
 > within the character class except the first position.)

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#22274

On 11/02/13 15:16, markspace wrote:
> On 2/11/2013 1:25 AM, Nigel Wade wrote:
>
>> Er, not quite. There's also '^' which, as the first character only,
>> negates the match.
>
> Did you read the next paragraph where I mention this?
>

Ah, not entirely.

My mistake.

-- 
Nigel Wade

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#22192

On Wed, 06 Feb 2013 16:28:29 -0800, Roedy Green
<see_website@mindprod.com.invalid> wrote, quoted or indirectly quoted
someone who said :

>ve always treated $ ( ) * + -. ? [ \ ] ^ { | }
>as reserved regex chars.
>I can't find any docs that say the list is different inside[  ].

I have not found an official source however it is claimed only [ - ^]
are reserved in character classes i.e inside [...]

I don't think that can be right.  Surely $ is reserved too, and of
course \.
-- 
Roedy Green Canadian Mind Products http://mindprod.com
The first 90% of the code accounts for the first 90% of the development time.
The remaining 10% of the code accounts for the other 90% of the development 
time. 
~ Tom Cargill  Ninety-ninety Law 

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#22196

On Thursday, February 7, 2013 8:31:47 AM UTC+1, Roedy Green wrote:
> On Wed, 06 Feb 2013 16:28:29 -0800, Roedy Green
> 
> <see_website@mindprod.com.invalid> wrote, quoted or indirectly quoted
> someone who said :
> 
> >ve always treated $ ( ) * + -. ? [ \ ] ^ { | }
> >as reserved regex chars.
> >I can't find any docs that say the list is different inside[  ].
> 
> I have not found an official source however it is claimed only [ - ^]
> are reserved in character classes i.e inside [...]

Is http://docs.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html not official enough?  Or are you missing an more explicit explanation on that page?

> I don't think that can be right.

Roedy, why???

>  Surely $ is reserved too, and of course \.

Dot has no special meaning and neither does $.  Btw. you can easily test that.  Apart from that dot with special meaning does not make sense in a character class if you think about it for a moment.

Cheers

robert

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#22225

On 2/7/2013 2:31 AM, Roedy Green wrote:
> On Wed, 06 Feb 2013 16:28:29 -0800, Roedy Green
> <see_website@mindprod.com.invalid> wrote, quoted or indirectly quoted
> someone who said :
>
>> ve always treated $ ( ) * + -. ? [ \ ] ^ { | }
>> as reserved regex chars.
>> I can't find any docs that say the list is different inside[  ].
>
> I have not found an official source however it is claimed only [ - ^]
> are reserved in character classes i.e inside [...]
>
> I don't think that can be right.  Surely $ is reserved too, and of
> course \.

I don't think "surely" can overrule documentation and
experimentation.

There is a reason that it is called software engineering
and not software feelings.

Arne

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