regex - Java regular expression bug -


i have following regular expression:

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

the rule attempting implement should allow strings of following format:

operation: (comma separated list of integers or real numbers)

for example following must allowed: 

min: 7, 89.7, 67 average: 67.9, 89, 9

however, accepts input of form

max: ,

how can avoid having blank spaces on either side of comma accepted?

try

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

tests:

min:4: true min:4,4: true min:4, 5: true min:4 , 5: false min: 7, 89.7, 67: true average: 67.9, 89, 9: true max: , : false

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