^start of line
.+any character (except for line terminators), repeated at least once
\ta tab character (ASCII 9)
+matches at least one character from the set below:
0-9one character from 0 (4810) to 9 (5710)
\na line-feed (newline) character (ASCII 10)
\1the text saved by group 1
\ta tab character (ASCII 9)
●the literal ● (967910 / 227178 / 25CF16)
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