Is there a more concise regular expression to accomplish this task?
- by mpminnich
First off, sorry for the lame title, but I couldn't think of a better one. I need to test a password to ensure the following:
Passwords must contain at least 3 of the following:
upper case letters
lower case letters
numbers
special characters
Here's what I've come up with (it works, but I'm wondering if there is a better way to do this):
Dim lowerCase As New Regex("[a-z]")
Dim upperCase As New Regex("[A-Z]")
Dim numbers As New Regex("\d")
Dim special As New Regex("[\\\.\+\*\?\^\$\[\]\(\)\|\{\}\/\'\#]")
Dim count As Int16 = 0
If Not lowerCase.IsMatch(txtUpdatepass.Text) Then
count += 1
End If
If Not upperCase.IsMatch(txtUpdatepass.Text) Then
count += 1
End If
If Not numbers.IsMatch(txtUpdatepass.Text) Then
count += 1
End If
If Not special.IsMatch(txtUpdatepass.Text) Then
count += 1
End If
If at least 3 of the criteria have not been met, I handle it. I'm not well versed in regular expressions and have been reading numerous tutorials on the web. Is there a way to combine all 4 regexes into one? But I guess doing that would not allow me to check if at least 3 of the criteria are met.
On a side note, is there a site that has an exhaustive list of all characters that would need to be escaped in the regex (those that have special meaning - eg. $, ^, etc.)?
As always, TIA. I can't express enough how awesome I think this site is.
