Yeah, I'm inclined to think it's an error in the docs.

> On Sep 18, 2019, at 14:43 , Gabriel Zachmann via Cocoa-dev 
> <cocoa-dev@lists.apple.com> wrote:
> 
>>> I don't see why / is a meta character.
>>> It does not appear anywhere else in the documentation as metacharacter.
>> 
>> In some languages "/" is used as the delimiter to begin/end a regular 
>> expression, for example in sed where the substitution command is 
>> "s/old/new/".
> 
> Right, good point - same in vi and vim (the editor).
> 
>> 
>> So perhaps the underlying regex parser ignores "/" characters at the 
>> start/end of the regex unless they're quoted?
> 
> Maybe, but I couldn't find any hint in the docs.
> 
> 
>> Is it used to refer to groups in text replacement? Sometimes that's a dollar 
>> sign, sometimes a slash, but I thought it was a backslash
> 
> Good point , but 
> -  IIRC, vim, at least, uses backslash for that, e.g., \1 ,\2, etc.;
> -  furthermore, NSRegularExpression does not do any text replacement by 
> itself, as far as I can see?
> 
> 
> Oh well, right now , I just don't escape any / , and it seems to work just 
> fine.
> 
> 
> Best regards, Gabriel
> 
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