need an array ref from grep

jeanluca has asked for the wisdom of the Perl Monks concerning the following question:

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Re: need an array ref from grep by davido (Cardinal) on Jun 16, 2006 at 15:03 UTC
Like this, perhaps: `my $arr_ref = [ grep( /[[:alpha:]]/, keys %h ) ];` [download] The `[...]` brackets are used as an anonymous array constructor. Dave	[reply] [d/l] [select]
Re: need an array ref from grep by jeffa (Bishop) on Jun 16, 2006 at 15:03 UTC
Don't use \, use `[]` `my $arr_ref = [ grep /[[:alpha:]]/, keys %h ] ;` [download] jeffa L-LL-L--L-LL-L--L-LL-L-- -R--R-RR-R--R-RR-R--R-RR B--B--B--B--B--B--B--B-- H---H---H---H---H---H--- (the triplet paradiddle with high-hat)	[reply] [d/l] [select]
Re: need an array ref from grep by jhourcle (Prior) on Jun 16, 2006 at 16:54 UTC
Somehow the \ in this case doesn't do what I need. Correct. The following: `\( ... )` takes a reference of every item in the list, without flattening it first. See the following as an example: Read more... (354 Bytes) This is also a useful trick for getting a reference to a scalar when your editor's syntax coloring (eg, BBEdit) thinks you're escaping a quote: `my $var = \('string');`	[reply] [d/l] [select]
Re: need an array ref from grep by monkey_boy (Priest) on Jun 16, 2006 at 15:04 UTC
Small change needed, use the anonymous array syntax: `my %h = ( 'a1' => 1, '001' => 1, '993' => 1, 'd' => 1, 'i' => 1) ; my $arr_ref = [(grep ( /[[:alpha:]]/, (keys(%h)) ))] ;` [download] This is not a Signature...	[reply] [d/l]
Re: need an array ref from grep by orderamidchaos (Initiate) on May 29, 2013 at 00:41 UTC
I know this is super old at this point, but for anyone else who references such things in their searches, here's another (IMHO cleaner) way to write greps... `my $arr_ref = [ grep {/[[:alpha:]]/} keys(%h) ];` You can also assign the result to a dereferenced variable: `my $arr_ref; @$arr_ref = grep {/[[:alpha:]]/} keys(%h);`	[reply] [d/l] [select]
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