When I run a file which is begin with "#!/usr/bin/perl -w", I get a error: "syntax error at line 153, near "=~ ?""

Question

When I run a file which is begin with #!/usr/bin/perl -w, I get a error:

syntax error at line 153, near "=~ ?"

I try to add "#!/bin/bash", this error is not append, but I get another

error: "line 34: syntax error near unexpected token `('"

line 153 in my file:

($output_volume =~ ?^([\S]+).mnc?) && ($base_name = $1) ||
  die "sharpen_volume failed: output volume does not appear to be"
  ." a minc volume.\n";

line34 in my file: use MNI::Startup qw(nocputimes);

Answer 1

$output_volume =~ ?^([\S]+).mnc?

This used to be valid perl and thus might appear in old code and instructional material.

From perlop:

In the past, the leading m in m?PATTERN? was optional, but omitting it would produce a deprecation warning. As of v5.22.0, omitting it produces a syntax error. If you encounter this construct in older code, you can just add m.