How can I check if a string ends with a particular substring in Liquid?

I know there is a contains keyword so I can use:

{% if some_string contains sub_string %}
    <!-- do_something -->
{% ... %}

But how can I check if a string ends with a particular substring?

I've tried this but it won't work:

{% if some_string.endswith? sub_string %}
    <!-- do_something -->
{% ... %}

As a workaround you could use the string slice method

• with as startIndex: some_string length - sub_string length and
• stringLength: sub_string size
• and if the result of the slice is the same as the sub_string -> the sub_string is at the end of some_string.

it's a bit clumpy in a liquid template but it would look like:

{% capture sub_string %}{{'subString'}}{% endcapture %}
{% capture some_string %}{{'some string with subString'}}{% endcapture %}

{% assign sub_string_size = sub_string | size %}
{% assign some_string_size = some_string | size %}
{% assign start_index = some_string_size | minus: sub_string_size %}
{% assign result = some_string | slice: start_index, sub_string_size %}

{% if result == sub_string %}
    Found string at the end
{% else %}
    Not found
{% endif %}

and if the some_string is empty or shorter than sub_string it works anyway because the slice result would be empty as well