^start of line
Non-Capturing Group(?:06|\+36|0036) \+the literal + (4310 / 538 / 2B16)
0036the literal text 0036 \d{1,2}a digit, repeated between 1 and 2 times
\d{3}a digit, repeated exactly 3 times
\d{3,4}a digit, repeated between 3 and 4 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