^start of line
.*?any character (except for line terminators), repeated any number of times
\+?optionally matches the literal + (4310 / 538 / 2B16)
0*the literal 0 (4810 / 608 / 3016) , repeated any number of times
0?optionally matches the literal 0 (4810 / 608 / 3016)
\d{3}a digit, repeated exactly 3 times
\d{3}a digit, repeated exactly 3 times
\d{4}a digit, repeated exactly 4 times
.*any character (except for line terminators), repeated any number of times
$end of line
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