In a regular expression, "\t" is a tab character, and I'm not sure what "\m" is, if anything. 

use Test::More 'tests' => 2;

ok( 'sef.mlxhelp.com' =~ /(\.mlxhelp)\.com/,
    q{'sef.mlxhelp.com' matches} );
ok( 'www.mlxhelp.com' =~ /(\.mlxhelp)\.com/,
    q{'www.mlxhelp.com' matches} );

[download]

Note that these will always put ".mlxhelp" in $1 when they match because the capturing parentheses are around that literal string.

In reply to Re^5: puzzled by pages by kyle
in thread puzzled by pages by grashoper

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