Why isn't my Twig replace filter working with craft.request.getUrl()?

Question

I'm rendering some HTML into a variable. On this HTML I want to replace a value using craft.request.getUrl() but the value doesn't seem to get replaced. Any idea what I'm doing wrong?

{% set pages %}
    {% set entries = craft.entries.section('pages') %}
    {% for entry in entries %}
         <a href="{{ entry.url }}" data-url="{{ entry.url }}">{{ entry.title }}</a>
    {% endfor %}
{% endset %}

{{ pages|replace({'data-url="{{ craft.request.getUrl() }}"': 'class="active"'})|raw }}

Answer 1

Try:

{{ pages|replace({('data-url="' ~ craft.request.getUrl() ~ '"'): 'class="active"'})|raw }}

You were double nesting Twig tags {{ {{ }} }}, which is never necessary. You'll want to use string concatenation instead. Also for dynamic keys in twig you need parentheses.