i am having a file in which i have statement

$ret_val = system("perl $ENV{SOURCE_ROOT}/scripts/Test_script.pl");
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and i want to make a substitution in which i want to remove occurence of perl from this line. i tried this by using file handle for that file and doing following substitution

$line =~ s|\perl \$ENV{SOURCE_ROOT}/scripts/Test_script.pl|\$ENV{SOURC
+E_ROOT}/scripts/Test_script|si;
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but i am getting following error message

Can't find unicode character property definition via main->e or e.pl a
+t unicode/Is/e.pl line 41
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i dont know why this is coming . how can this be removed so that my substituton is done correctly

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