Silverstripe extension to replace some stuff in $Title and other StringFields

NetwerkstattStringFieldExtension.php

<?php

/**
 * Created by IntelliJ IDEA.
 * User: Werner M. Krauß <werner.krauss@netwerkstatt.at>
 * Date: 01.12.2015
 * Time: 15:36
 */
class NetwerkstattStringFieldExtension extends Extension {

	private static $casting = [
		'Replace' => 'HTMLText'
	];

	private static $replacements = [
		'(c)' => '&copy;',
		'(r)' => '<sup>&reg;</sup>',
		'(tm)' => '<sup>&trade;</sup>',
		'|' => '<br>'
	];

	public function Replace() {
		$replacements = Config::inst()->get('NetwerkstattStringFieldExtension', 'replacements');

		$search = array_keys($replacements);
		$replace = array_values($replacements);

		return str_replace($search, $replace, $this->owner->value);
	}
}

You can configure the replacements using the SilverStripe config API.

For a SS4 compatible and tested version see https://packagist.org/packages/wernerkrauss/ss-stringfield-replace