Digits are, in Perl regular expressions, word characters.
If you want to exclude digits, you can use character classes: Either those defined by POSIX (only if you don't have Unicode characters), or using Unicode properties in a recent Perl.
Here's a Unicode-aware example:
use strict;
use warnings;
my $text = "John P5ete Andrew Richard58 Nic4k Le7on5";
my @names = $text =~ /\b\p{Alphabetic}*\d\p{Alphabetic}*\b/g;
print "@names\n";
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You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
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