I have added a regex which will check for least 8 characters, at least one number, one uppercase letter, one lowercase letter and one special character
This is the regex Used
'(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[$#$!%*?&])[A-Za-zd$#$!%*?&].{8,}'
The above regex works fine for most of the scenarios but when I use
1oB!gb0s5
or
Pass#123
It fails. Can anyone tell me the issue here.
Here is the portion of your regex which actually consumes the input:
[A-Za-zd$#$!%*?&].{8,}
This means that the password must start with one of the characters in the above character class. It also means that a valid password must have nine or more characters, because the class counts for one, and {8,} means 8 or more. So the following would fail because it does not begin with any such character:
1oB!gb0s5
The second example you gave fails for a different reason, because it only has 8 characters:
Pass#123
I don't know exactly what logic you want here. If you just want to ensure that a password has a lowercase, uppercase, number, and special character, then maybe you can remove the leading character class and just stick with the lookaheads:
(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[$#$!%*?&]).{8,}
Here is a demo which shows that your two example passwords would pass using the above pattern.
Demo
Related
I have seen answers for strong password checks but I have an additional requirement for the order in which the characters appear.
The password should contain at least:
One upper case letter.
One lower case letter.
One number.
One special character.
The order being:
Should start with upper case and lower case letters.
Followed by number and/or alphabetical characters.
In the end, should be a special character.
e.g.
Xyz1325# is valid.
aBcd123xYz# is also valid.
#Xyz1234 is invalid.
1234Xyz# is invalid.
Xyz# is invalid.
Introducing a specific order of characters in a password makes it relatively more predictable, hence losing the strength of it, and I'll suggest you to get away with that restriction. Nevertheless, you can use this regex that will meet your needs,
^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[~!##$%^&*])[a-zA-Z][a-zA-Z\d]*[~!##$%^&*?<>]*$
Explanation:
^ --> Start of string
(?=.*[a-z]) --> Ensures the password has at least one lowercase letter.
(?=.*[A-Z]) --> Ensures the password has at least one uppercase letter.
(?=.*\d) --> Ensures the password has at least one digit.
(?=.*[~!##$%^&*]) --> Ensures the password has at least one special character from this set. You can put more characters inside that you want to treat as special.
Now comes the part for ensuring the order. As you said it should start with an alphabet, hence we need the first character as,
[a-zA-Z]
Then following it can be alphabet or numbers hence you can use,
[a-zA-Z\d]*
And finally you want special characters, and by your this statement "In the end, should be a special character." I assume you do not want to restrict it to just one single special character, hence at the end of regex it should be this,
[~!##$%^&*?<>]*
which can match one or more special characters. If you really meant just one special character then just make it [~!##$%^&*?<>]
And finally end it with $ to stop matching the string.
Live Demo
Hope this works for you. Or else, let me know for any other queries.
Edit
Bonus:
If you want to check length as well you can do so using the following:
^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[~!##$%^&*])(?=.{6,18}$)[a-zA-Z][a-zA-Z\d]*[~!##$%^&*?<>]*$
The additional (?=.{6,18}$) is to ensure that your regex has length between 6 to 18.
#Pushpesh,
Please correct if wrong.
The regex I believe you are looking for is this: https://regex101.com/r/nO2DxE/2
Explanation:
These groups (?=.*[A-Z].*) (?=.*[0-9].*) (?=.*[a-z].*) make sure your string contains at least one uppercase letter, one lowercase letter and one digit. The rest of the regex checks that the order you described is respected.
Overall, the regex is:
(?=.*[A-Z].*)(?=.*[0-9].*)(?=.*[a-z].*)^[a-zA-z][a-zA-Z0-9]*[#!#+-]$
I'm trying to create a regex to test passwords against. My current one checks for the following:
One Uppercase Letter
One Lowercase Letter
One number
Currently, the user can't enter special characters, however I'm trying to add that as an optional check (so Testing1 and Testing1! should both match). I've tried:
^(?=.*[A-Za-z])(?=.*\d)(?=.*[$#$!%*#?&])(A-Za-z\d[$#$!%*#?&]?){8,}$
But it doesn't catch it. I have a feeling my special character set is in the wrong place, but I'm not sure where to place it.
Where do I add my list of special characters as optional checks?
There's many ways that you can set up your regex, such as creating a whitelist, or a blacklist, for types of characters. This one in particular creates a whitelist for characters that can be used which seems to be what you are looking for.
^(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])[A-Za-z0-9$#$!%*#?&]{8,}$
Regex Breakdown:
^ // Assert position at start of the line
(?=.*[A-Z]) // First positive lookahead, makes sure a capital character exists
(?=.*[a-z]) // Make sure a lowercase character exists
(?=.*[0-9]) // Make sure a number exists
[A-Za-z0-9$#$!%*#?&] // All of the possible characters that can be typed
{8,} // 8 to infinity characters
$ // Assert position at end of line
Since you say that you want special characters as optional, they are just placed in the possible characters that can be typed, but they are not validated by any positive lookaheads.
See this regex in action on regex101. Keep in mind, the modifiers gm are there to validate across lines in this example and should probably be removed in your use case.
Of course you may have reasons for the "whitelist" approach, but a more common approach, and one you may want to look into trying sometime, is to allow almost anything (blacklist), and then validate that a certain criteria is met.
Conditions for password
Minimum length should be 7
It must contain at-least one Capital letter
It must contain at-least one numeric
It must contain at-least one special character
/^(?=.{7,50}$)(?=.*[0-9])(?=.*[!##$%^&*_])(?=.*[a-z])(?=.*[A-Z])[a-zA-Z0-9!##$%^&*_].*/
It is working for passwords Mouse#123 but not working for Mouse_123
Your regex can be simplified to this:
/^(?=.*\d)(?=.*[!##$%^&_])(?=.*[A-Z])[a-zA-Z\d!##$%^&_]{7,50}$/
You need not have (?=.*{7,50}$) lookahead as that can be done outside as well. Besides requirement of at least one small letter is not there in your question.
I trying to create a Regular Expression for a password that can accept only
digits and letters (a-zA-Z).
In the password at least one digit must to be, and at least one letter. All the text between 10-12 symbols.
I created the next REGEX :
/^(?=.*[A-Za-z])(?=.*[0-9]).{10,12}$/
The problem is that any signs like $,%me,#,space also acceptable.
How can I add a rule saying any others signs accepts letters,digits are not acatbale?
Instead of using ., which is any character, use [A-Za-z0-9]:
/^(?=.*[A-Za-z])(?=.*[0-9])[A-Za-z0-9]{10,12}$/
The lookaheads will be satisfied as long as there is a single alphabetic and a single numeric character in the 10-12 list of characters, but . allows any of the other 8-10 characters be anything.
However, I would suggest you not do this because requirements on passwords are not a good thing. You should let people enter whatever password they want.
Try with this:
/^[a-zA-Z0-9]*$/
and with limit:
/^[a-zA-Z0-9]{10,12}$/
I'm trying to create a regex pattern that allows the user to create a username with the following specifications. (For the purposes of this initial pattern, I'm only using standard american English alphabet.
The first character must be an alphabetic letter (uppercase or lowercase). [a-zA-Z]
The last character must be a alphanumeric (uppercase or lowercase). [a-zA-Z0-9]
Any characters in between must be letters or numbers with one rule:
The user can use a period(.), dash(-), or underscore(_) but it must be followed by an alphanumeric character. So no repeats of one or more of these characters at a time.
I've tried the following regex pattern but am not getting the results I was hoping for. Thanks for taking the time to help me on this.
^[a-zA-Z]([a-zA-Z0-9]+[._-]?[a-zA-Z0-9]+)+$
EDIT
It might actually be working the way I expected. But I'm always getting two matches returned to me. The first one being the entire valid string, the second being a shortened version of the first string usually chopping off the first couple of characters.
Examples of valid inputs:
Spidy
Spidy.Man
Ama-za-zing_Spidy
Examples of invalid inputs:
Extreme___Spidy (repeated underscores)
The_-_Spidy (repeated special characters)
_ _ SPIDY _ _ (starts and ends with special characters)
Sounds like this pattern:
^[a-zA-Z]([._-]?[a-zA-Z0-9])*$
^[a-zA-Z]([._-]?[a-zA-Z0-9]+)*$