java - Regex - starts with OPERATION and must be followed by either an integer or double -

so have follow input string

operation: 12, 12.32, 54.3332 

operation can of min, max, sum. regex should accept strings start of 3 words follow colon , followed either integer or double.

i have been googling , fidling around hours before decided turn guys.

thanks time!

edit:

so far have ended regex

^[max:sum:average:min:(\\d+(\\.\\d+)?), ]+$ 

it matches "max: " correct "max:" , "ma: . matches strings of following format : "max: 12, 12.3323......"

you misunderstand meaning of []. these refer single character alternatives.

so [max:sum:average:min:(\\d+(\\.\\d+)?), ] either m or a or x or .... mmmmm should match.

you may want more this:

^(max|sum|average|min): (\\d+(\\.\\d+)?(, (?=.)|$))+$

explanation:

(max|sum|average|min) either max, sum, average or min.
": " refers actual characters : , space.
\\d+(\\.\\d+)? had before.
", " refers actual characters , , space.
(?=.) look-ahead. checking following characters (?=) matches single character (.) (thus not end-of-string) there isn't ", " required @ end.
, (?=.)|$ either ", " not @ end or nothing @ end.

alternative: not using look-ahead

^(max|sum|average|min): (\\d+(\\.\\d+)?(, \\d+(\\.\\d+)?)*)$

test both.

reference.