I am looking for a regex with at least 6 characters (no limit) including at least one digit. No spaces allowed.

I have this this regex:

^(?=.*\d).{4,8}$

However, I don't want to limit to 8 characters.

I am looking for a regex with at least 6 characters (no limit) including at least one digit. No spaces allowed.

I have this this regex:

^(?=.*\d).{4,8}$

However, I don't want to limit to 8 characters.

• javascript
• regex

• Please clarify: Are spaces disallowed thoughout or only in the first 6 characters? – acraig5075 Commented Jun 10, 2015 at 7:54
• no spaces at all. this is for password input. so 'abc123' is ok but 'abc 123' no. – user2587454 Commented Jun 10, 2015 at 9:30

2 Answers 2

a regex with at least 6 characters (no limit) including at least one digit. no spaces allowed.

^(?=\D*\d)\S{6,}$

Or

^(?=\D*\d)[^ ]{6,}$

See demo

• ^ Start of string
• (?=\D*\d) - Must be 1 digit (the lookahead is based on the principle of contrast)
• \S{6,} - 6 or more non-whitespaces
  OR
  [^ ]{6,} - 6 or more characters other than literal normal space

To enable the regex to match more than 6 characters, you only need to adjust the quantifier. See more about limiting quantifiers here.

^(?=.*\d)([\w]{6,})$

I think it should work fine