Someone explain to me regular expressions
, I don't quite understand what the following fragment means.
RETURN '^(1|B)[A-Z0-9]{6}\.1L[1-9]{1}$';
**(1|B)**[A-Z0-9]{6}\.1L[1-9]{1}**$**
EL 1|B what does it mean?
I understand that the following segment can contain from A to Z and from 0 to 9 up to a maximum of 6 digits, and I don't understand what the $ character is for either.