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PhutilRemarkupHighlightRule.php
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			<?php

			final class PhutilRemarkupHighlightRule extends PhutilRemarkupRule {

			public function getPriority() {
			return 1000.0;
			}

			public function apply($text) {
			if ($this->getEngine()->isTextMode()) {
			return $text;
			}

			return $this->replaceHTML(
			'@!!(.+?)(!{2,})@',
			array($this, 'applyCallback'),
			$text);
			}

			protected function applyCallback(array $matches) {
			// Remove the two exclamation points that represent syntax.
			$excitement = substr($matches[2], 2);

			// If the internal content consists of ONLY exclamation points, leave it
			// untouched so "!!!!!" is five exclamation points instead of one
			// highlighted exclamation point.
			if (preg_match('/^!+\z/', $matches[1])) {
			return $matches[0];
			}

			// $excitement now has two fewer !'s than we started with.
			return hsprintf('<span class="remarkup-highlight">%s%s</span>',
			$matches[1], $excitement);

			}

			}