The error message is the following Bad evalled substitution pattern.

According to perldiag:

You've used the /e switch to evaluate the replacement for a substitution, but perl found a syntax error in the code to evaluate, most likely an unexpected right brace '}'.

However, the only regular expression in your example that uses /e is not only commented out, but is valid syntax.

The code you showed actually produces the error message "Substitution replacement not terminated".

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