matching any character including newline, in a RegExp

[Bart Lateur]

In Perl, matching any character, including newline, can be done with the
/s regexp switch, as /.+/s matches a string of any character.
Apparently, the Javascript RegExp engine doesn't recognize that switch.

So, what must I use? I'm now using

(?:.|\n)+

but looks inefficient to me: A character class is allegedly vastly
faster than an alternation.

I've thought of

.*(?:\n.*)*

but I have doubts about this one, too.

 

[Bart Van der Donck]

In Perl, matching any character, including newline, can be done with the
/s regexp switch, as /.+/s matches a string of any character.
Apparently, the Javascript RegExp engine doesn't recognize that switch.
So, what must I use? [...]

/[\s\S]/