Exclude only 0 in regular expression javascript

Question

I want to create a regular expression which will take one to ten numeric value but it should not accept if only 0's are provided

for example

1 is valid input
1111123455 is valid input
01 is valid input
010 is valid input
0000 is not valid input
0 is also not valid input
0000000000 is also not valid input 

i tried regex

^([0-9]{1,10}|)$

which accepts ten numeric but how to avoid only 0's

Answer 1

You may use a negative lookahead:

^(?!0+$)[0-9]{1,10}$

See the regex demo

Details:

• ^ - start of string
• (?!0+$) - no just zeros are allowed up to the end of string
• [0-9]{1,10} - 1 to 10 digits
• $ - end of string.

NOTE: To also allow empty value, use 0 as the min argument in the limiting quantifier:

^(?!0+$)[0-9]{0,10}$
              ^

See How Negative Lookahead Works (more here) to learn more about how (?!0+) works in this pattern. In short: right at the start of the string, we check the whole string for just zeros. If there is a zero or more right after start of a string, the match is failed. Else, 1 (or 0) to 10 digits are matched and the result is returned.