Perl's had something like that for a long time: quote operators. You can quote a string using " or ' (which mean different things), and you can quote a regex using /. But for each of these you can change the quote character by using a quote operator: qq for the double-quote behavior, q for the single-quote behavior, and qr for the regex behavior. (There are a few others two, but I used these most often.)
my $str1 = qq!This is "my" string.!;
my $str2 = qq(Auto-use of matching pairs);
$str2 =~ qr{/url/match/made/easy};
The work I did with Perl included a LOT of url manipulation, so that qr{} syntax was really helpful in avoiding ugly /\/url\/match\/made\/hard/ style escaping.
Perl is still, I think, the gold standard for quoting and string manipulation syntax. I am to this day routinely perplexed by the verbosity and ugliness of simple operations on strings in other languages.
(Of course, this may also be one of the reasons that programmers in its broad language family have a pronounced tendency to shoehorn too many problems into complex string manipulation, but I suppose no capability comes without its psychological costs.)
Python has triple-quoted strings which generally do the trick, and uses prefixes for "non-standard" string behaviours (though it doesn't have a regex version IIRC, Python 3.6 adds interpolation via f-strings)
str1 = f"""This is "my" string."""
str2 = """Auto-use of matching pairs"""
str3 = r"""/url/match/made/easy"""
Yes, I've belatedly caught on to using triple-quotes to avoid some escaping. But I didn't know about the f-strings - thanks! (I'll be using those when I start using 3.6.)
