Hi Try this code for example,

undef $/;
open (INP, 'text.txt');
$string = <INP>; 
close INP;

$string =~s#"...Row AutoFitHeight="0"><Cell><Data ss:Type="Strin.."#ne
+wstring#gsi;

open (OUT, ">".'text1.txt');
print OUT "$string";
close OUT;
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