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Newsgroups: comp.lang.java.programmer
Date: Thu, 7 Feb 2013 04:38:26 -0800 (PST)
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Subject: Re: regex reserved chars
From: Robert Klemme <shortcutter@googlemail.com>
Cc: Roedy Green <see_website@mindprod.com.invalid>
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Xref: csiph.com comp.lang.java.programmer: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