You weren't doing the check on $1 in your original code.

if($1 => 1 and $1 <= 75 and /\d{1}-\d{2}/) { ... }
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The /\d{1}-\d{2}/ is done on $_, not $1.

BTW you could just do the whole-number check right away:

if ($_ =~ /\something(\d*)somethingelse/i){ 
    if($1 => 1 and $1 <= 75) { ... }
}
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