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PhutilRemarkupAnchorRule.php
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			<?php

			final class PhutilRemarkupAnchorRule extends PhutilRemarkupRule {

			public function getPriority() {
			return 200.0;
			}

			public function apply($text) {
			return preg_replace_callback(
			'/{anchor\s+#([^\s}]+)}/s',
			array($this, 'markupAnchor'),
			$text);
			}

			protected function markupAnchor(array $matches) {
			$engine = $this->getEngine();

			if ($engine->isTextMode()) {
			return null;
			}

			if ($engine->isHTMLMailMode()) {
			return null;
			}

			if ($engine->isAnchorMode()) {
			return null;
			}

			if (!$this->isFlatText($matches[0])) {
			return $matches[0];
			}

			if (!self::isValidAnchorName($matches[1])) {
			return $matches[0];
			}

			$tag_view = phutil_tag(
			'a',
			array(
			'name' => $matches[1],
			),
			'');

			return $this->getEngine()->storeText($tag_view);
			}

			public static function isValidAnchorName($anchor_name) {
			$normal_anchor = self::normalizeAnchor($anchor_name);

			if ($normal_anchor === $anchor_name) {
			return true;
			}

			return false;
			}

			public static function normalizeAnchor($anchor) {
			// Replace all latin characters which are not "a-z" or "0-9" with "-".
			// Preserve other characters, since non-latin letters and emoji work
			// fine in anchors.
			$anchor = preg_replace('/[\x00-\x2F\x3A-\x60\x7B-\x7F]+/', '-', $anchor);
			$anchor = trim($anchor, '-');

			return $anchor;
			}

			}