\d+a digit, repeated at least once
xthe literal x (12010 / 1708 / 7816) (case sensitive)
\d+a digit, repeated at least once
Positive Lookahead(?=\.jpg) \.the literal . (4610 / 568 / 2E16)
jpgthe literal text jpg (case sensitive) g modifier: global. Finds all matches instead of stopping after the first