Re: Why is / a metachar in regular expressions ?
Re: Why is / a metachar in regular expressions ?
- Subject: Re: Why is / a metachar in regular expressions ?
- From: Rick Mann via Cocoa-dev <email@hidden>
- Date: Wed, 18 Sep 2019 14:01:09 -0700
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.
> On Sep 18, 2019, at 13:51 , Jens Alfke via Cocoa-dev
> <email@hidden> wrote:
>
>
>
>> On Sep 18, 2019, at 1:45 PM, Gabriel Zachmann via Cocoa-dev
>> <email@hidden> 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/".
>
> So perhaps the underlying regex parser ignores "/" characters at the
> start/end of the regex unless they're quoted?
>
> —Jens
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Rick Mann
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