Regex, detect no spaces in the string

Question

This is my current regex check:

const validPassword = (password) => password.match(/^(?=.*\d)(?=.\S)(?=.*[a-zA-Z]).{6,}$/);

I have a check for at least 1 letter and 1 number and at least 6 characters long. However I also want to make sure that there are no spaces anywhere in the string.

So far I'm able to enter in 6 character strings with spaces included :(

Found this answer here, but for some reason in my code it's passing.

What is the regular expression for matching that contains no white space in between text?

Graham · Accepted Answer · 2017-09-24 14:44:33Z

8

It seems you need

/^(?=.*\d)(?=.*[a-zA-Z])\S{6,}$/

Details

^ - start of string
(?=.*\d) - 1 digit (at least)
(?=.*[a-zA-Z]) - at least 1 letter
\S{6,} - 6 or more non-whitespace chars
$ - end of string anchor

With a principle of contrast in mind, you may revamp the pattern into

/^(?=\D*\d)(?=[^a-zA-Z]*[a-zA-Z])\S{6,}$/

edited Sep 24, 2017 at 14:44

Graham

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answered May 3, 2017 at 15:20

Wiktor Stribiżew

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2 Comments

Devendra Lattu Over a year ago

That's a great explanation.

Leon Gaban Over a year ago

Thanks! Geez Regex is always over my head, hardly run into a case where I have to use it.

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