What is the format for pattern String in pattern Attribute?

Question

I want to have a password or form pattern defined by myself but I can't find in Internet how to do that customized ones.

I know there are ng-pattern in angularJs and pattern attribute in HTML but my problem is what is the format for that and what does '{ }', '[ ]', '/' mean? And how to set AND, OR conditions in that?

Can someone help me with this?

Answer 1

You can use pattern attribute in HTML and define your custom pattern in it.

See below:

<input type="password" id="password" name="password" placeholder="password"
pattern="^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&])[A-Za-z\d$@$!%*?&]{8,}" required="required" />

This pattern will have a check that password contains lowercase, uppercase, special character and numeric value.

Answer 2

Try this

ng-pattern="/^([A_])+(([\._\-\~\=\+\?\*\@])*([a-zA-Z0-9])*)*$/"

[A_]- This checks that your pattern starting with Alphabet A.

• / -> Charachters delimit the regular expression

• ^ -> Match at the beginning of the line

• . followed by * -> Match any character (.), any number of times (*)

• $ -> End of the line