ZTree Regex Puzzle Solution Strict - Part 2 of 2
^
(
[A-Z]
{4}
)
(
_20
)
(
[1-9]
)
Options: case insensitive; ^ and $ match at line breaks
Assert position at the beginning of a line (at beginning of the string or after a line break character)
Match the regular expression below and capture its match into backreference number 1
Match a single character in the range between "A" and "Z"
Exactly 4 times
Match the regular expression below and capture its match into backreference number 2
Match the characters "_20" literally
Match the regular expression below and capture its match into backreference number 3
Match a single character in the range between "1" and "9"