Yes. But there's another possibility: - quoting Regexp Quote-Like Operators in perlop:
x   Use extended regular expressions;
specifying two x's means \t and the SPACE character are ignored within square-bracketed character classes

In reply to Re^3: Matching backslash in regexp negative lookbehind by soonix
in thread Matching backslash in regexp negative lookbehind by 1nickt

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