Positive Lookahead(?=^PLAN) ^start of line
PLANthe literal text PLAN (case sensitive) .*?any Unicode character, repeated any number of times
^start of line
+?matches at least one character from the set below:
\da Unicode decimal digit
the literal (3210 / 408 / 2016)
\s{2,}a Unicode whitespace character, repeated at least 2 times
.*any Unicode character, repeated any number of times
\s{2,}a Unicode whitespace character, repeated at least 2 times
\da Unicode decimal digit
.*?any Unicode character, repeated any number of times
$end of line
.*?any Unicode character, repeated any number of times
^start of line
REFERENCE:the literal text REFERENCE: (case sensitive) \s*a Unicode whitespace character, repeated any number of times
+matches at least one character from the set below:
\da Unicode decimal digit
the literal (3210 / 408 / 2016)
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
s modifier: single line. Allows a dot to match line terminators