I think what you want is something like the following: 
my $str = '012346.jpg 012346-all.jpg 012346-EXP.jpg';
while ($str =~ /(\d+)(.*?\.jpg)/gi) {
    print "$1$2\n";
}

[download]
Where $1 is the number, $2 the rest.

In reply to Re: regex help by TedPride
in thread regex help by calypso

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