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Postings from June 2021
On 6/30/21 6:22 AM, Nicholas Clark wrote:
> On Wed, Jun 30, 2021 at 06:18:13AM -0600, Karl Williamson wrote:
>
>> $ blead -Dr -le "qr'$foo'm"
>> Compiling REx ""
>> Final program:
>> 1: NOTHING (2)
>> 2: END (0)
>> minlen 0
>> Enabling $` $& $' support (0x7).
>
> I think that your Unix shell quoting is not doing you favours here.
>
> I think that for this examples the shell will replace $foo with an empty
> string, as the shell is processing the "" quotes. So you perl one-liner
> is not what you intended. (I believe).
>
> And in the other, \$ is processed by the shell, not perl's parser.
>
> Nicholas Clark
>
Sorry. Hopefully this is better
§ cat nwc.pl
qr'$foo'm;
qr'\$foo'm;
§ blead -Dr nwc.pl
Compiling REx "$foo"
Final program:
1: MEOL (2)
2: EXACT <foo> (4)
4: END (0)
anchored "foo" at 0..0 (checking anchored) minlen 3
Compiling REx "\$foo"
Final program:
1: EXACT <$foo> (3)
3: END (0)
anchored "$foo" at 0..0 (checking anchored isall) minlen 4
Enabling $` $& $' support (0x7).
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