(?m)applies the following effective flags to the remainder of the pattern: gm m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string
EventCodethe literal text EventCode (case sensitive) \s*any whitespace character, repeated any number of times
=the literal = (6110 / 758 / 3D16)
\s*any whitespace character, repeated any number of times
4625the literal text 4625