^start of line
\w+a Unicode word character, repeated at least once
\s+a Unicode whitespace character, repeated at least once
\w+a Unicode word character, repeated at least once
\s*a Unicode whitespace character, repeated any number of times
,the literal , (4410 / 548 / 2C16)
\s*a Unicode whitespace character, repeated any number of times
\w+a Unicode word character, repeated at least once
.*any Unicode 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
u modifier: unicode. Treats the pattern and subject as UTF-16