What, nobody will offer a single suggestion for how to fix such?

/['"]$a->{b} ['"]/x
/['"]\Q$a->{b}\E['"]/
/['"]$a->{b}(?:)['"]/
[download]

I was surprised to find that the detection of the regex terminating delimiter depends on part of the parsing of the regex contents. I'm not sure I like that.

I was also surprised that my first attempt didn't work, since I thought this was supported for exactly this type of problem, despite the ambiguity it presents:

/['"]${a->{b}}['"]/
[download]

I'm curious if any of these surprises are because things have changed since some earlier version of Perl, but I don't have the time right now to find older versions to test against.