.*any character (except for line terminators), repeated any number of times
the literal (3210 / 408 / 2016)
Group 1([0-9]|[1-9][0-9]{1,4}|1[0-9]{5}|2[0-2][0-9]{4}|230000) 0-9one character from 0 (4810) to 9 (5710)
2nd Alternative[1-9][0-9]{1,4} 1-9one character from 1 (4910) to 9 (5710)
Character Class[0-9]{1,4} {1,4}matches between 1 and 4 characters from the set below:
0-9one character from 0 (4810) to 9 (5710)
1the literal 1 (4910 / 618 / 3116)
{5}matches exactly 5 characters from the set below:
0-9one character from 0 (4810) to 9 (5710)
4th Alternative2[0-2][0-9]{4} 2the literal 2 (5010 / 628 / 3216)
0-2one character from 0 (4810) to 2 (5010)
{4}matches exactly 4 characters from the set below:
0-9one character from 0 (4810) to 9 (5710)
230000the literal text 230000 the literal (3210 / 408 / 2016)
1the literal 1 (4910 / 618 / 3116)
2the literal 2 (5010 / 628 / 3216)
0 Xthe literal text 0 X (case sensitive) .*any character (except for line terminators), repeated any number of times
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