var FONTFACE_PATTERN = /(?:^|)(?:(?<=(?:font-family[:] ?))['"](.+?)['"]|(?<=(?:font-weight[:])) ?(.+?)|(?<=(?:font-style[:])) ?(.+?)|(?<=src: ?url[(])(?:['"]?data:(.+?)[;,](base64)[,])(.+?)(?:['"]?[)])(?:[\n\s ]?format[(]['"](\S+)['"][)])?)(?:[;][\n])(?:|$)/mdg

Rudimentary pattern for matching base64-embedded webfonts in CSS stylesheets, including:

• font-family
• font-style
• font-weight

Also matches the various parts of the datauri sequence:

• mime-type
• charset
• format(...)
• and the base64 string itself

Includes the multi-line and global modifier flags to match multiple @font-face rules in a single document.

MIT © Nicholas Berlette