Splits camelCase or PascalCase words into individual words.

splitCamelCase.js

/**
 * Splits a Pascal-Case word into individual words separated by spaces. 
 * @param {Object} word
 * @returns {String}
 */
function splitPascalCase(word) {
	var wordRe = /($[a-z])|[A-Z][^A-Z]+/g;
	return word.match(wordRe).join(" ");
}


/**
 * Splits a camelCase or PascalCase word into individual words separated by spaces. 
 * @param {Object} word
 * @returns {String}
 */
function splitCamelCase(word) {
	var output, i, l, capRe = /[A-Z]/;
	if (typeof(word) !== "string") {
		throw new Error("The \"word\" parameter must be a string.");
	}
	output = [];
	for (i = 0, l = word.length; i < l; i += 1) {
		if (i === 0) {
			output.push(word[i].toUpperCase());
		}
		else {
			if (i > 0 && capRe.test(word[i])) {
				output.push(" ");
			}
			output.push(word[i]);
		}
	}
	return output.join("");
}

splitWords.js

/** Splits a camel-case or Pascal-case variable name into individual words.
 * @param {string} s
 * @returns {string[]}
 */
function splitWords(s) {
	var re, match, output = [];
	// re = /[A-Z]?[a-z]+/g
	re = /([A-Za-z]?)([a-z]+)/g;

	/*
	matches example: "oneTwoThree"
	["one", "o", "ne"]
	["Two", "T", "wo"]
	["Three", "T", "hree"]
	*/

	match = re.exec(s);
	while (match) {
		// output.push(match.join(""));
		output.push([match[1].toUpperCase(), match[2]].join(""));
		match = re.exec(s);
	}

	return output;

}