Regular expression to match version numbers

Question

I need a regular expression that is matching below criteria

For example : below should be matched

1
1134
1.1
1.4.5.6

Those below should not match:

.1
1.
1..6

Answer 1

You can use

^\d+(\.\d+)*$

See demo

• ^ - beginning of string
• \\d+ - 1 or more digits
• (\\.\\d+)* - a group matching 0 or more sequences of . + 1 or more digits
• $ - end of string.

You can use a non-capturing group, too: ^\\d+(?:\\.\\d+)*$ , but it is not so necessary here.