function createRegExp() {
	/*
	* Regular expression for leading whitespace.
	*
	* Regular expression: `/^\s+/`
	*
	* -   `^`
	*     -   match the start of input
	* -   `\s+`
	*     -   match one or more whitespace characters
	*/
	return /^\s+/;
}
Returns a regular expression for matching leading whitespace.

@private
@returns {RegExp} regular expression

@example
var RE_LEADING_WHITESPACE = createRegExp();

var bool = RE_LEADING_WHITESPACE.test( '   var x = 3;' );
// returns true