Re^3: Regex to detect file name

is equivalent

No, it really isn't:

use strict;
use warnings;

use Test::More tests => 2;

my $in = "\N{LATIN SMALL LETTER C WITH CEDILLA}";

like ($in, qr{\A[A-Za-z0-9](?:[A-Za-z0-9_.-]*?[A-Za-z0-9]|)\z}, 'kcott
+');
like ($in, qr{ \A [[:alnum:]] (?: [[:alnum:]_.-]* [[:alnum:]])? \z }xm
+s, 'AnomalousMonk');
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Comment on Re^3: Regex to detect file name Download Code

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Re^4: Regex to detect file name
by AnomalousMonk (Archbishop) on Jul 06, 2018 at 23:23 UTC

Hmmm... Good point. Well, I think in a case like this, I'd still like to try to take advantage of some degree of factoring:

c:\@Work\Perl\monks>perl -wMstrict -le
"use charnames ':full';
 ;;
 use Test::More tests => 2;
 ;;
 my $in = qq{\N{LATIN SMALL LETTER C WITH CEDILLA}};
 ;;
 like ($in, qr{\A[A-Za-z0-9](?:[A-Za-z0-9_.-]*?[A-Za-z0-9]|)\z}, 'kcot
+t');
 ;;
 my $alpha      = qr{ [A-Za-z0-9]    }xms;
 my $alpha_plus = qr{ $alpha | [_.-] }xms;
 like ($in, qr{ \A $alpha (?: $alpha_plus* $alpha)? \z }xms, 'Anomalou
+sMonk');
"
1..2
not ok 1 - kcott
#   Failed test 'kcott'
#   at -e line 1.
#                   'ô'
#     doesn't match '(?^:\A[A-Za-z0-9](?:[A-Za-z0-9_.-]*?[A-Za-z0-9]|)
+\z)'
not ok 2 - AnomalousMonk
#   Failed test 'AnomalousMonk'
#   at -e line 1.
#                   'ô'
#     doesn't match '(?^msx: \A (?^msx: [A-Za-z0-9]    ) (?: (?^msx: (
+?^msx: [A-Za-z0-9]    ) | [_.-] )* (?^msx: [A-Za-z0-9]    ))? \z )'
# Looks like you failed 2 tests of 2.
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/a

(?a)

qr{ \A [[:alnum:]] (?: [[:alnum:]_.-]* [[:alnum:]])? \z }xms

Give a man a fish: <%-{-{-{-<

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