PhutilRemarkupUnderlineRule.php
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	<?php

	final class PhutilRemarkupUnderlineRule extends PhutilRemarkupRule {

	public function getPriority() {
	return 1000.0;
	}

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

	return $this->replaceHTML(
	'@(?<!_\|/)__([^\s_/].?_)__(?!/\|\.\S)@s',
	array($this, 'applyCallback'),
	$text);
	}

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

	}