The oxy_replace function is used to replace a string of text.
The oxy_replace() function has two signatures:
This function replaces each substring of the text that matches the literal target string with the specified literal replacement string.
This function replaces each substring of the text that matches the target string with the specified replacement string.
image[href]{
content:oxy_url(oxy_base-uri(), oxy_replace(attr(href), '.jpeg', 'Thumbnail.jpeg'));
}