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Re: regex: how to I pick out items in the middle?

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From:
ToddAndMargo via perl6-users
Date:
October 30, 2022 02:29
Subject:
Re: regex: how to I pick out items in the middle?
Message ID:
68686ba6-2fa8-602f-d3eb-cd466bdec150@zoho.com
>> On Sat, Oct 29, 2022 at 6:46 PM ToddAndMargo via perl6-users 
>> <perl6-users@perl.org <mailto:perl6-users@perl.org>> wrote:
>> 
>>     Hi All,
>> 
>>     With a regex, how do I pick out items in the middle of the string?  Two
>>     from the beginning or two from the end?
>> 
>> 
>>     4] > my Str $y="xxxxxx"; $y ~~ s/ $([.*-2]) "x"/Q/; print $y ~ "\n"
>> 
>>     ===SORRY!=== Error while compiling:
>>     Malformed postfix call
>>     ------> my Str $y="xxxxxx"; $y ~~ s/ $([.*⏏-2]) "x"/Q/; print $y ~ "\n"
>> 
>> 
>> 
>>     I am trying to do something like this:
>> 
>>     [0] > my Str $x="1\n2\n3\n4\n5\n"
>>     1
>>     2
>>     3
>>     4
>>     5
>> 
>>     [1] > print $x.lines[*-2] ~ "\n"
>>     4

On 10/29/22 19:16, William Michels via perl6-users wrote:
> In the Raku REPL:
> 
> $ raku
> Welcome to Rakudo™ v2022.07.
> Implementing the Raku® Programming Language v6.d.
> Built on MoarVM version 2022.07.
> 
> To exit type 'exit' or '^D'
> [0] > #beginning
> Nil
> [1] > my Str $y="xxxxxx"; S/^ x ** 2 /QQ/.say given $y;
> QQxxxx
> [1] > #inner
> Nil
> [2] > my Str $y="xxxxxx"; S/^ [x ** 2] <(x ** 2)> /QQ/.say given $y;
> xxQQxx
> [2] > #end
> Nil
> [3] > my Str $y="xxxxxx"; S/ x ** 2 $/QQ/.say given $y;
> xxxxQQ
> 
> HTH, Bill.
> 

Yes it does!  Thank you!

What does capitol S do?

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