如何用Jekyll Liquid的if语句检测字符串中的句号？

你的代码存在两处Liquid语法错误，导致contains "."的判断逻辑失效，具体修正如下：

错误点分析 #

• assign语句语法错误：Liquid的{% assign %}标签内部引用变量不需要套{{}}，你写的{% assign member = {{members.basic_info.website}} %}会导致变量赋值失败。
• elsif条件语法错误：{% elsif %}标签里的变量引用同样不需要{{}}，{{members.basic_info.website}} contains "."的写法会破坏条件判断逻辑。

修正后的代码 #

{% assign member = members.basic_info.website %}
{% if member == nil or member contains "asd" or member contains "alesanchezr" or member contains " " %}
    <p>dont show</p>      
{% elsif member contains "." %}
    <p>has period</p>
{% endif %}

额外优化建议 #

如果想避免空值引发的潜在问题，可以先判断变量是否存在，再执行后续逻辑：

{% assign member = members.basic_info.website %}
{% if member %}
    {% if member contains "asd" or member contains "alesanchezr" or member contains " " %}
        <p>dont show</p>
    {% elsif member contains "." %}
        <p>has period</p>
    {% endif %}
{% else %}
    <p>dont show</p>
{% endif %}

内容的提问来源于stack exchange，提问作者Alex Ayala Palacin