\s*any whitespace character, repeated any number of times
\p{L}*any Unicode letter, repeated any number of times
\1{2}the text saved by group 1, repeated exactly 2 times
\p{L}*any Unicode letter, 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