Regex: how to only allow integers greater than zer

Question

I have tried the following to only allow integers in my text box, this works great but it allows a zero in there. Is there anything else I can add to prevent a zero being added?

\d+

Answer 1

Code:

^([1-9][0-9]+|[1-9])$

Example: http://regexr.com/3annd

Tested with:

0
10
01
11
00
1
100

Answer 2

A minor variation is this:

/\d*[1-9]\d*/

That would allow leading zeros.

Answer 3

This will allow 10 but not 01, and it will allow only numbers consisting of digits, i.e., no periods or minus signs...but also no plus signs, scientific notation etc.

^[1-9][0-9]*$

Answer 4

^(\d{2}[1-9])$

matches with: from 001 to 999 example 001 099 999

does not match 000 01 0

Answer 5

If you are not concerned about negatives and silly numbers like 07, this will do:

/[1-9]\d*/

For a more robust solution, I suggest converting the matched string to integer and check if it fulfills your criteria.

Answer 6

^(0*[1-9][0-9]*)$

This will allow "silly" numbers like 007 as well, but not 0 or 000 or an empty string.

Note that \d matches also digits from other character sets like ٠١٢٣٤٥٦٧٨٩. See: \d is less efficient than [0-9].

^ denotes the start, $ the end of the string. Together they ensure that the whole string is matched.