perl -MO=Deparse -e "split('|', 'ab|c');"                   
split(/|/, 'ab|c', 0);
-e syntax OK
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There is one subtle difference between using '...' and /.../ as regex delimiters. The latter interpolates where the former does not. That does not affect the examples in this thread though.

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Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

"Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."

And the difference between "..." and /.../ is that "..." unescapes too much.

For example,
"\d" is the same as /d/.
If you want /\d/, the equivalent would be "\\d".

I always use /.../ or qr/.../ to avoid confusion.