Character Class[[:alpha:]]+ +matches at least one character from the set below:
[:alpha:]an alphabetic character [a-zA-Z]
-the literal - (4510 / 558 / 2D16)
0-9one character from 0 (4810) to 9 (5710)
.*any character (except for line terminators), repeated any number of times
\.*the literal . (4610 / 568 / 2E16) , repeated any number of times
rpmthe literal text rpm (case sensitive) g modifier: global. Finds all matches instead of stopping after the first
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string