hamishcampbell/gist:872020

## gistfile1.php
<?php
$rx = <<<'RX'
/
	(
		(\\.) |              # Any escaped character
		([^<${]) |           # Any character that isn't <, $ or {
		(<[^%]) |            # < if not followed by %
		($[^A-Za-z_]) |      # $ if not followed by A-Z, a-z or _
		({[^$]) |            # { if not followed by $
		({$[^A-Za-z_])       # {$ if not followed A-Z, a-z or _
	)+
	/Sx
RX;
$string = <<<'STRING'
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" >

  <head>
		<% base_tag %>
		<title>$Title &raquo; $SiteConfig.Title</title>
		$MetaTags(false)
		<link rel="shortcut icon" href="/favicon.ico" />

		<% require themedCSS(layout) %>
		<% require themedCSS(typography) %>
		<% require themedCSS(form) %>

		<!--[if IE 6]>
			<style type="text/css">
			 @import url(themes/blackcandy/css/ie6.css);
			</style>
		<![endif]-->

		<!--[if IE 7]>
			<style type="text/css">
			 @import url(themes/blackcandy/css/ie7.css);
			</style>
		<![endif]-->
	</head>
<body>
<div id="BgContainer">
	<div id="Container">
		<div id="Header">
			$SearchForm
	   		<h1>$SiteConfig.Title</h1>
	    	<p>$SiteConfig.Tagline</p>
		</div>

		<div id="Navigation">
			<% include Navigation %>
	  	</div>

	  	<div class="clear"><!-- --></div>

		<div id="Layout">
		  $Layout
		</div>

	   <div class="clear"><!-- --></div>
	</div>
	<div id="Footer">
		<% include Footer %>
	</div>
</div>

</body>
</html>
STRING;

$result = preg_match($rx, $string);
	<?php
	$rx = <<<'RX'
	/
	(
	(\\.) \| # Any escaped character
	([^<${]) \| # Any character that isn't <, $ or {
	(<[^%]) \| # < if not followed by %
	($[^A-Za-z_]) \| # $ if not followed by A-Z, a-z or _
	({[^$]) \| # { if not followed by $
	({$[^A-Za-z_]) # {$ if not followed A-Z, a-z or _
	)+
	/Sx
	RX;
	$string = <<<'STRING'
	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" >

	<head>
	<% base_tag %>
	<title>$Title » $SiteConfig.Title</title>
	$MetaTags(false)
	<link rel="shortcut icon" href="/favicon.ico" />

	<% require themedCSS(layout) %>
	<% require themedCSS(typography) %>
	<% require themedCSS(form) %>

	<!--[if IE 6]>
	<style type="text/css">
	@import url(themes/blackcandy/css/ie6.css);
	</style>
	<![endif]-->

	<!--[if IE 7]>
	<style type="text/css">
	@import url(themes/blackcandy/css/ie7.css);
	</style>
	<![endif]-->
	</head>
	<body>
	<div id="BgContainer">
	<div id="Container">
	<div id="Header">
	$SearchForm
	<h1>$SiteConfig.Title</h1>
	<p>$SiteConfig.Tagline</p>
	</div>

	<div id="Navigation">
	<% include Navigation %>
	</div>

	<div class="clear"><!-- --></div>

	<div id="Layout">
	$Layout
	</div>

	<div class="clear"><!-- --></div>
	</div>
	<div id="Footer">
	<% include Footer %>
	</div>
	</div>

	</body>
	</html>
	STRING;

	$result = preg_match($rx, $string);