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PhutilRemarkupDelRule.php
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			<?php

			final class PhutilRemarkupDelRule extends PhutilRemarkupRule {

			public function getPriority() {
			return 1000.0;
			}

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

			return $this->replaceHTML(
			'@(?<!~)~~([^\s~].?~)~~@s',
			array($this, 'applyCallback'),
			$text);
			}

			protected function applyCallback(array $matches) {
			return hsprintf('<del>%s</del>', $matches[1]);
			}

			}