check if string contains both number and letter (at least)

I wish to check if a password contains at least one letter and a number. 开发者_StackOverflowspecial characters are accepted but not required...

That will be a simple password checker.

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You can use lookahead assertions to check for existence of any digit and any letter as:

^(?=.*[a-zA-Z])(?=.*[0-9])

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Using a single regex for this can lead to somewhat unreadable/unreliable code. It may make more sense to use simpler regexes eg [0-9] to check for the existence of a digit and break the requirements of your password strength checker into a multi-line if. Also this allows you to know more readily at what stage the validation failed and possibly make suggestions to the user.

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([0-9].*[a-zA-Z])\|([a-zA-Z].*[0-9])

Not sure if the pipe needs to be escaped in your regexp environment or not.

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Simple solution to check for password containing at least one letter, at least one digit and no spaces:

\S*(\S*([a-zA-Z]\S*[0-9])|([0-9]\S*[a-zA-Z]))\S*

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/.*?(?:[a-z].*?[0-9]|[0-9].*?[a-z]).*?/

(just one possible solution)

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This works for me

/^(\d+[a-zA-Z]|[a-zA-Z]+\d)(\d|[a-zA-Z])*/mg