Converting email addresses into links using Twig macro

This macro is useful for keeping your static translations HTML-free. If you have some email addresses in text, you don't need to manually wrap them in <a> tags - macro will do it for you, using regular expression.

As a bonus, it will also make these addresses hidden from spambots by replacing @ in address with corresponding HTML entity - @. Such address is rendered by browser exactly the same way as regular one and is fully usable. Spambots however, might have problems with recognizing it as email address and ignore it. Well, at least these dumber ones that don't render HTML, but just scan trough website source code.

Here's macro code. You can test it out using interactive demo.

{% macro emailLinks(text, class) %}
{% spaceless %}
{% set text = text|replace('/([a-zA-Z0-9_.+-]+)+@([a-zA-Z0-9-]+.[a-zA-Z]+)/', '<a ' ~ (class ? 'class="' ~ class ~ '" ') ~ 'href="mailto:'~ '\\1&#64;\\2' ~'">'~ '\\1&#64;\\2' ~'</a>') %}
{{text|raw}}
{% endspaceless %}
{% endmacro %}

Macro accepts two parameters:

• text that will be parsed.
• class - optional parameter that can be used to add class to links.

Further reading #

• https://www.pinnacledisplays.com/unicode-converter.htm - protecting email addresses from spambots using various techniques.