\S*any non-whitespace character, repeated any number of times
\ban ASCII word boundary
wwwthe literal text www (case sensitive) \.the literal . (4610 / 568 / 2E16)
youtubethe literal text youtube (case sensitive) \.the literal . (4610 / 568 / 2E16)
comthe literal text com (case sensitive) \S*any non-whitespace character, repeated any number of times
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string