Trim leading whitespace from code examples

gistfile1.js

function escapeHtml(str) {
	return str.toString().replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/&(\s)/g, "&amp;$1");
}

function prepareCodeExample(str) {
	str = str.toString();
	//remove blank lines at the start and end of the example
	var description = str.match(/^\s*.*\s*()/)
	str = str.replace(/^(\s*[\r\n]+)+/, "").replace(/([\r\n]+\s+)+$/, "");
	//read the space at the start for the 1st line of code
	var startGap = str.match(/^\s*/)[0];
	//remove that from all lines, hopefully normalising the tab indent
	str = str.replace(new RegExp("^" + startGap, "mg"), "").replace(/\t/g, "  ");
	
	return escapeHtml(str);
}