how to use dotall flag for regex.exec()

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In 2018, with the ECMA2018 standard implemented in some browsers for the time being, JS regex now supports s DOTALL modifier:

Browser support

console.log("foo\r\nbar".match(/.+/s)) // => "foo\r\nbar"

Actually, JS native match-all-characters regex construct is 

[^]

It means match any character that is not nothing. Other regex flavors would produce a warning or an exception due to an incomplete character class (demo), though it will be totally valid for JavaScript (demo).

The truth is, the [^] is not portable, and thus is not recommendable unless you want your code to run on JS only. 

regex = /--Head([^]*)--\/Head/

To have the same pattern matching any characters in JS and, say, Java, you need to use a workaround illustrated in the other answers: use a character class with two opposite shorthand character classes when portability is key: [\w\W], [\d\D], [\s\S] (most commonly used).

NOTE that [^] is shorter.

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