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PhabricatorMonospacedFontSetting.php
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			<?php

			final class PhabricatorMonospacedFontSetting
			extends PhabricatorStringSetting {

			const SETTINGKEY = 'monospaced';

			public function getSettingName() {
			return pht('Monospaced Font');
			}

			public function getSettingPanelKey() {
			return PhabricatorDisplayPreferencesSettingsPanel::PANELKEY;
			}

			protected function getSettingOrder() {
			return 500;
			}

			protected function getControlInstructions() {
			return pht(
			'You can customize the font used when showing monospaced text, '.
			'including source code. You should enter a valid CSS font declaration '.
			'like: `13px Consolas`');
			}

			public function validateTransactionValue($value) {
			if (!phutil_nonempty_string($value)) {
			return;
			}

			$filtered = self::filterMonospacedCSSRule($value);
			if ($filtered !== $value) {
			throw new Exception(
			pht(
			'Monospaced font value "%s" is unsafe. You may only enter '.
			'letters, numbers, spaces, commas, periods, hyphens, '.
			'forward slashes, and double quotes',
			$value));
			}
			}

			public static function filterMonospacedCSSRule($monospaced) {
			// Prevent the user from doing dangerous things.
			return preg_replace('([^a-z0-9 ,"./-]+)i', '', $monospaced);
			}

			}