Reputation: 2599

Regex for dot and digit validation

I am trying to validate dot and numbers.

Valid:

1.2.3
1.4.1

Invalid:

1.2.3.
1.2-3
1-2-3

I tried the following from another thread, it works with the valid, but it also passes the invalid with dash (-).

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

Any betterment to the regex so it strict to validate only dot and digit?

Thanks

Upvotes: 3

Answers (5)

Reputation: 870

The dot matches all characters, you should use \.

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

But this would also validate any number without dot, when at least 1 dot should be present use:

(\d+\.)+\d+

Upvotes: 1

Reputation: 5492

If you need a variable number of dots and digits repeat digits & dots and put the last as only digit:

(\d+\.)+\d+

it matches 1.2.3 1.2.3.4 and so on

If you need fixed length of digits put the number of repetitions instead of the + operator

(\d+\.){2}\d+ #for 1.2.3
(\d+\.){1}\d+ #for 1.2

Upvotes: 2

Reputation: 17194

Ttry this:

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

Upvotes: 3

Reputation: 32306

You need to escape the dot, which is otherwise "any character" in a regex:

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

Upvotes: 4

Reputation: 13460

use this regular expression ^\d+\.\d+\.\d+$

your misstake in dot, dot mean any symbol

Upvotes: 1