<?php namespace SilverStripe\UserForms\Modifier; use SilverStripe\Forms\SegmentFieldModifier\SlugSegmentFieldModifier; class UnderscoreSegmentFieldModifier extends SlugSegmentFieldModifier { public function getPreview($value) { return str_replace('-', '_', parent::getPreview($value)); } public function getSuggestion($value) { return str_replace('-', '_', parent::getSuggestion($value)); } }