Split a string into two colors

macro_split.tpl.twig

  {% macro split_title(text) %}
    {% set text = render(text) %} {# only when doing twig for drupal 7 #}
    {% set chunks = text|split('~') %}
    {% for chunk in chunks %}
        {{ (loop.index0 is odd)?"<em>"~chunk~"</em>":chunk}}
    {% endfor %}
 {% endmacro %}


<h3>{{ split_title('This is a ~text~ with some ~colors~') }}</h3>
 

<h3>This is a <em>text</em> with some <em>colors</em></h3>`

CSS example :

h3 em {
    color: #CAFE00;
    font-style: normal;
  }