pub static ATTR_LIST_PATTERN: LazyLock<Regex>Expand description
Pattern to match attr_list syntax: {: #id .class key="value" }
The : prefix is optional (kramdown style uses it, but attr_list accepts both)
Requirements for valid attr_list:
- Must start with
{and optional:with optional whitespace - Must contain at least one of: #id, .class, or key=“value”
- Must end with
}