What does regular expression \\s*,\\s* do?
That regex "\\s*,\\s*"
means:
\s*
any number of whitespace characters- a comma
\s*
any number of whitespace characters
which will split on commas and consume any spaces either side
\s
stands for "whitespace character".- It includes
[ \t\n\x0B\f\r]
. That is:\s
matches a space( ) or a tab(\t) or a line(\n) break or a vertical tab(\x0B sometimes referred as \v) or a form feed(\f) or a carriage return(\r) .
\\s*,\\s*
It says zero or more occurrence of whitespace characters, followed by a comma and then followed by zero or more occurrence of whitespace characters.
These are called short hand expressions.
You can find similar regex in this site: http://www.regular-expressions.info/shorthand.html