\s*any whitespace character, repeated any number of times
,the literal , (4410 / 548 / 2C16)
Negative Lookahead(?!\s*\p{Ll}) \s*any whitespace character, repeated any number of times
\p{Ll}a lowercase letter
\s*any whitespace character, 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