Daniel Jeney :
I would like to split a string:"x= 2-3 y=3 z= this, that" I would split this up on one or more whitespaces, that are not preceded by a '=' or a ',' meaning group one: "x= 2-3" two: "y=3" three: "z= this, that" I have an expression that kinda does it but its only good if = or , has only one whitespace after it.
(?<![,=])\\s+
JvdV :
Thinking the other way around (looking forward instead of backwards), would the following do the job for you?
\\s+(?=\\S*=)
\\s+- one or more whitespace characters(?=\\S*=)- positive lookahead to make sure it's followed by as many non-whitespace characters and a literal equal sign.