JavaScript Javascript/Node.js regexp optimization: is there any benefits to place regexp outside of function? [duplicate] javascript node regex,node js regexp,node js regexp match,

So I know that in Javascript instantiating a regex causes it to be compiled automatically and if that regex is stored in a variable it will be reused without recompiling. Example:

var re = /[Ff]oo|[Bb]ar/;
"Foo".match(re); // ["Foo"]
"Baz".match(re); // null

However, are duplicated regular expressions recompiled or does V8 (Chrome/Node.js) intelligently re-use them (like PHP does with preg_* functions)?

function isFooBar(str) {
  return str.match(/[Ff]oo|[Bb]ar/);
}
isFooBar("Foo"); // ["Foo"]
isFooBar("Baz"); // null

So to clarify, I know the first example results in one compilation of the regex. But what about the second example?

Answer:1

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