I am doing form validation for a password using Python and Flask. The password needs to contain at least one uppercase letter and at least one number.
My current failed attempt…
re.compile(r'^[A-Z\d]$')
Python Regex: password must contain at least one uppercase letter and number
flaskpythonregex
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Best Answer
We can use the pattern
'\d.*[A-Z]|[A-Z].*\d'to search for entries that have at least one capital letter and one number. Logically speaking there are only two ways that a capital letter and a number can appear in a string. Either the letter comes first and the number after or the number first and the letter after.The pipe | indicates 'OR', so we will look at each side separately.
\d.*[A-Z]matches a number that is followed by a capital letter,[A-Z].*\dmatches any capital letter that is followed by a number.