Examples of websites using
Regular
(Regular is a sans-serif font designed by A2 Type. The family is available in 7 Weights + Italics in each style, each with various weights and matching italics)
with
Matter
(Matter is a sans-serif font designed by Martin Vácha and released by Displaay Type Foundry in 2017. The font family consists of multiple styles with varying weights and matching italics)