> 0x01

Why do you specify the length in hex?

Also note that if you use a length greater than 1 (which you want to speed it up), you can find false positives: read $fh, my $char, 2 reports 0x13 present in the following file: 

a1

[download]

because 

$ perl -wE 'say unpack "H*", "a1"'
6131
 ~~

[download]

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re^3: How to find Unicode: 0x13 in File by choroba
in thread How to find Unicode: 0x13 in File by dirtdog

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