On 11/23/2011 12:43 PM, Brad King wrote:
> On 11/23/2011 12:34 PM, Alexandru Ciobanu wrote:
>> The regex in question is:
>> ^[^][:/*?]+\$
>>
>> And it appears at this location in the ITK source tree:
>> CMake/ExternalData.cmake:347
>>
>> And the expression is correct, because you're allowed to have the ]
>> metacharacter inside a [^xyz] class if it comes immediately after ^.
>
> Ironically I was the one that wrote that regex ;)
>
>> TRE does not do it the same way, see
>> (http://laurikari.net/tre/documentation/regex-syntax/ the "Bracket
>> expressions" section):
Wait, that documentation does say the same thing:
bracket-expression ::= "[" item+ "]"
| "[^" item+ "]"
"To include a literal ] in the list, make it either the first item"
That's exactly what this regex does. It uses the second production
rule in the above grammar fragment and puts the ']' first after '^'.
-Brad
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