At first sight it looked as if a minor modification was necessary, but grep has run through the array and returned a list before the lhs can get at each match variable, preventing them being assigned to keys of %inp (normally you'd use $1 not $_).

map was probably invented for this kind of reason. But the example doesn't really demand it that strongly when the lhs is a hash - 'for' still seems adequate and simple to me: 

#!/usr/bin/perl 

use strict ;
use warnings ;

my @inp = ("abc_A_bla", "abc_B_bla", "abc_C_bla") ;

my %inp ;

$inp{ $1 } = /\w{3}_(\w)/ || next for @inp; 

foreach ( keys %inp ) {
    print "Found $_\n" ;
}

[download]

-M

Free your mind

In reply to Re: from array to hash with grep by Moron
in thread from array to hash with grep by jeanluca

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.