问题
I was trying to install joomla on my website. While installing joomla, I was asked to create a MYSQl user. But I couldn't because, everytime I type as password, it gives a message saying the paswword doesn't meet the reqular expression requirement. Given below is the regular expression
'(?=^.{8,}$)((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$'
What does this mean? What password can I give? Give an example of a password that will pass this regular expression test. Please help me
回答1:
(?=^.{8,}$)
This part means has 8 more more characters, and the match starts at the start of input.
((?=.*\d)
Means contains a digit.
|(?=.*\W+))
Or contains something that is neither a letter or a digit
(?![.\n])
not starting with a dot or UNIX newline.
(?=.*[A-Z])
Contains at least one capital letter.
(?=.*[a-z])
Contains at least one lowercase letter
.*$
Consists entirely of non-newline characters and the matched group will contain the entire string.
回答2:
Password should be 8 symbols or more, atleast one digit or a non-character , atleast one lower alpha and atleast one upper alpha and not beginning with . or newline ( seriously?)
Example: Manojlds9
来源：https://stackoverflow.com/questions/5800156/what-does-this-regular-expression-in-joomla-mean