Develop Reference

How to make input password require at least one special character (bracket included)

I was wondering how to add in the special character part with brackets like {} [] () and other stuff like " ' - to the unique character I tried below, but for some reason when I add in another of those characters it stops working.
<-- works but does not have any brackets or quotes for special character-->
<form acton = "#">
<input type="password" id="newPass" required
pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*?[0-9])(?=.*?[!##$%^&*+`~=?\|<>/]).{8,}"
<button>submit</button>
</form>
The part above works but does not have quotes or more special character
Code below has bracket but does not work
<-- does not work (if you do not enter special character user will be able to submit but it does not have any brackets -->
<form acton = "#">
<input type="password" id="newPass" required
pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*?[0-9])(?=.*?[~`!##$%^&*()-_=+[]{};:'.,"\|/?><]).{8,}"
<button>submit</button>
</form>
also this did not work (from an answer)
<form acton = "#">
<input type="password" id="pass" required
pattern="(?=.*\d)(?=.*[a-z])(?=.*?[0-9])(?=.*?[~`!##$%\^&*()\-_=+\[\]{};:\'.,\"\\|/?\>\<]).{4,}">
<button>submit</button>
</form>
I am looking for an answer that makes the bottom part (the one with brackets and all of those special character I included) works.

Since it is regex, all of the characters inside [.....] are allowed, so you should add brackets to there. You can do this with the usage of escape character (because brackets has a role in regex). So just add \] and \[ to the characters allowed inside [.....].
try:
<input type="password" name="pw" pattern="(?=.*?[#?!#$%^&*-\]\[])"
By the way.. I would recommend working with regex cheat sheet, it will help you a lot in validation tasks.
As for your EDIT:
The " and ' needed to be escaped. While \" \' won't work you can use \x27 and \x22 instead, these are the hexadecimal representation of " and ' in the ascii table.
try:
<form acton = "#">
<input type="password" id="pass" required pattern = "(?=.*\d)(?=.*
[a-z])(?=.*?[0-9])(?=.*?[~`!##$%\^&*()\-_=+[\]{};:\x27.,\x22\\|/?><]).{4,}">
<button>submit</button>
</form>

You should escape regex (e.g. \]) characters if they need to be matched during pattern search. Also, refer to the existing answer:
Braces and brackets in passwords
The following works for me, hopefully it should work at your end:
(I merely added escaped characters)
<input type="password" id="newPass" required
pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*?[0-9])(?=.*?[!##$%^&*+`~'=?\|\]\[\(\)\-<>/]).{8,}">

You're actually very close. The biggest mistakes are:
You should escape some of the special characters inside the character group and you should have hyphen as the last character (otherwise it's a range).
Here is the RegExp you request:
<input type="password" id="pass" required pattern = "(?=.*\d)(?=.*[a-z])(?=.*?[0-9])(?=.*?[~`!##$%^&*()_=+\[\]{};:&apos;.,"\\|\/?><-]).{4,}">
Update: I forgot to html encode the pattern for use directly in html. Now it should work.

Javascript pattern (regular expression) for input type text in jsp page

I am trying the below pattern to test the text mentioned like ex: ZKB9/20320216/alphanumerictext. Its not working. I have never used regular expressions and appreciate your help. JSP code below:
<input type="text" value="" size="40" id="txtABCNo" name="txtABCNo" required pattern="[A-Z][A-Z][A-Z][0-9]\/[0-9]{8}$\/^\w+$"></input>

ZKB9/20320216/alphanumerictext
This is Java RegEX for above Code: [A-Z0-9]{4}/[0-9]{8}/[a-z]*
<input type="text" value="" size="40" id="txtABCNo" name="txtABCNo" pattern="[A-Za-z0-9]{4}/[0-9]{8}/[a-z]*" title="Enter the Code like this :: ZKB9/20320216/alphanumerictext ">

In the pattern that you tried, you can omit the ^ before matching the word characters \w. You can also omit the $ at the end, as the pattern is anchored using the pattern property.
[A-Z]{3}[0-9]\/[0-9]{8}\/\w+
Regex demo

why doesn't ng-pattern work?

In the following form, the ng-pattern validation does not work.
The regex works as i expect in https://regex101.com.
It should show .custom-error div if the user enters some special character.
Where am I doing it wrong?
<form novalidate name="myForm">
<label for="subnet">only alphanumeric</label>
<input type="text" name="subnet" ng-model="subnet" class="form-control"
id="subnet" required ng-pattern="/[a-zA-Z\x7f-\xff]\s*/">
<div class="custom-error" ng-show="myForm.subnet.$error.pattern">
not in one of predefined characters
</div>
</form>

I think the ng-show="myForm.subnet.$error.pattern" is wrong. I read the official angular doc and i think you should try ng-show="!myForm.subnet.$valid" instead :
<input type="text" name="subnet" ng-model="subnet" class="form-control" id="subnet" required ng-pattern="/[a-zA-Z\x7f-\xff]\s*/">
<div class="custom-error" ng-show="!myForm.subnet.$valid">
not in one of predefined characters
</div>
It hope it will help you

Change the ng-pattern code to ng-pattern="/^[a-zA-Z\x7f-\xff\s]*$/". It will work now.
Working plunker here
All the best.

HTML input pattern not working validation

I have very strange issue.
in a very sample search form with one input field:
<input pattern="\S.{3,}" name="text"/>
The validation fails for value dds sdsd, but JS says it's Ok.
/\S.{3,}/.test(' dds sdsd')
true
/\S.{3,}/.test(' ')
false
Maybe I am missing something small or pattern is wrong, but according to regex.com it should be valid.
The idea is to prevent submit empty spaces. I am searching for a solution without write JS code.
<form method="GET" action="/">
<input class="form-control" name="text" type="text" pattern="\S.{3,}" />
<input type="submit" value="search" >
</form>

The HTML5 pattern is anchored by default, ^(?: and )$ are added at the start/end of the pattern when it is passed JS regex engine.
You need to use
<input pattern=".*\S.{3,}.*" name="text"/>
to make it work the same way as in JS with RegExp#test.
However, to require at least 1 non-whitespace char in the input, I'd recommend using
<input pattern="\s*\S.*" name="text"/>
See this regex demo. It will match 0+ whitespace chars at the start of the string (\s*), then will match any non-whitespace char (\S) and then will grab any 0+ chars greedily up to the end of the input.
<form method="GET" action="/">
<input class="form-control" name="text" type="text" pattern="\s*\S.*" title="No whitespace-only input allowed."/>
<input type="submit" value="search" >
</form>

HTML5 minimum character length validation ignoring spaces and tabs

I am using HTML5 'pattern' attribute with 'required' for validation of input boxes. HTML5's required attribute works but it can accept spaces and tabs which is not good because user will just put spaces then. I need regex such that it will accepts space and tabs but able to count only character's. Example "ronny jones" this should give 10.
In javascript we do it using something like this, I am looking for similar thing in HTML5
var name = document.forms['contact']['name'].value.replace(/ /g,""); // remove whitespace
if(name.length<6){ // count number of character.
document.getElementById('message').innerHTML="Enter correct Name";
return false;
}
I found one related question to this on SO : Is there a minlength validation attribute in HTML5? but it accepts spaces and tabs, which I don't want.
Below is my code with HTML5 pattern,
<input type="text" name="name" class="form-control" placeholder="Your Full Name" pattern="[A-Za-z]{6,}" title="Name should have atleast 6 characters." required="" />

I managed a silly hack that does what you asked:
<input type="text" name="name" class="form-control" placeholder="Your Full Name" pattern="\s*(\S\s*){6,}" title="Name should have at least 6 characters." required="" />
There must be 6 non-space characters for this to pass. so "asdfgh", " abc def " will work, but "abc de" fails.
It DOES NOT work for your comment about "there's a space after Anthony" but as Anthony contains 6 characters, then it's fine? If not, can you clarify further in the question.
To explain how it works:
it takes a pattern of "take 1 non-space character" \S followed by "none-or-more space characters" \s*
you need the pattern to be matched 6 or more times (pattern){6,} i.e. (\S\s*){6,}
then allow non-or-more spaces at the front \s*
If you want to limit the characters allowed to Alpha only, change the \S to [A-Za-z].
Yes, it's a hack IMO as it will be hell to parse internally on long strings. But does the job. You might want to mix with maxlength to limit that as well?

<form action="demo.php">
<input id="name" type="text" pattern="^((?:\s*[A-Za-z]\s*){6,})$">
<input type="submit">
</form>
this will work for your case .. its exacly how you want it. i have set limit of character is from 6 to 40..