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From: Nigel Wade <nmw@ion.le.ac.uk>
Newsgroups: comp.lang.java.programmer
Subject: Re: regex reserved chars
Date: Mon, 11 Feb 2013 09:25:08 +0000
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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